Advice needed to get WiFi coverage

I would like to ask for advice in order to cover the whole building of WiFi. Currently the circuit is a Vdsl 100mbps and i got my router in basement. Each floor has an openwrt router acting as client, in order to give WiFi access, 5of them. Currently each floor has its own SSID and i would like to change it and have common SSIDs (2 of them) in each floor. One for IOT(192.168.1.0/24 )and one for the access to LAN (192.168.5.0/24). Ideally i would like to create the SSIDs on the main router and then be automatically created on the client OPEWRT routers, if possible, please.

I am stuck with the config, through LUCI and i am looking for some help please.

You can configure the same ESSID/ PSK on all (WDS/ 4addr) APs and distribute the samr broadcast domain that way. There is no provision in OpenWrt to configure other/ connected devices centrally.

I'm using similar setup with FB7362SL act as VDSL2 modem + AP (fast roaming) in basement and MR1800X 5/2.4 AX router upper flor .2.4 is fast roaming with same ssid 5ghz is for bandwidth hungry devices using separate ssid . It's stable

root@MR1800X:~# uci show network
network.loopback=interface
network.loopback.device='lo'
network.loopback.proto='static'
network.loopback.ipaddr='127.0.0.1'
network.loopback.netmask='255.0.0.0'
network.globals=globals
network.globals.packet_steering='1'
network.globals.ula_prefix='fd6d:54ca:77bf::/48'
network.@device[0]=device
network.@device[0].name='br-lan'
network.@device[0].type='bridge'
network.@device[0].ports='lan1' 'lan2' 'lan3' 'wan'
network.@device[0].ipv6='0'
network.lan=interface
network.lan.device='br-lan'
network.lan.proto='static'
network.lan.netmask='255.255.255.0'
network.lan.ipaddr='192.168.1.2'
network.lan.ipv6='0'
network.@device[1]=device
network.@device[1].name='wan'
network.@device[1].mtu='1508'
network.@device[2]=device
network.@device[2].type='8021q'
network.@device[2].ifname='wan'
network.@device[2].vid='9'
network.@device[2].name='wan.9'
network.wan=interface
network.wan.proto='pppoe'
network.wan.username='login@neostrada.pl'
network.wan.password='haslo'
network.wan.ipv6='0'
network.wan.mtu='1500'
network.wan.device='wan.9'
root@7362sl:~# uci show network
network.loopback=interface
network.loopback.device='lo'
network.loopback.proto='static'
network.loopback.ipaddr='127.0.0.1'
network.loopback.netmask='255.0.0.0'
network.globals=globals
network.globals.ula_prefix='fd38:14e1:71f6::/48'
network.globals.packet_steering='1'
network.dsl=dsl
network.dsl.annex='b'
network.dsl.tone='av'
network.dsl.ds_snr_offset='-40'
network.dsl.firmware='/lib/firmware/vdsl.bin'
network.dsl.xfer_mode='ptm'
network.dsl.line_mode='vdsl'
network.@device[0]=device
network.@device[0].name='lan1'
network.@device[0].macaddr='08:96:D7:05:A5:0B'
network.@device[0].mtu='1508'
network.@device[1]=device
network.@device[1].name='lan2'
network.@device[1].macaddr='08:96:D7:05:A5:0B'
network.@device[2]=device
network.@device[2].name='lan3'
network.@device[2].macaddr='08:96:D7:05:A5:0B'
network.@device[3]=device
network.@device[3].name='lan4'
network.@device[3].macaddr='08:96:D7:05:A5:0B'
network.lan=interface
network.lan.device='br-lan'
network.lan.proto='static'
network.lan.ipaddr='192.168.1.5'
network.lan.netmask='255.255.255.0'
network.lan.ipv6='0'
network.lan.gateway='192.168.1.2'
network.lan.dns='192.168.1.2'
network.@device[4]=device
network.@device[4].name='dsl0'
network.@device[4].macaddr='08:96:D7:05:A5:0F'
network.@device[4].mtu='1508'
network.@device[5]=device
network.@device[5].name='dsl0.35'
network.@device[5].type='8021q'
network.@device[5].ifname='dsl0'
network.@device[5].vid='35'
network.@device[6]=device
network.@device[6].name='br-lan'
network.@device[6].type='bridge'
network.@device[6].ipv6='0'
network.@device[6].ports='wlan0' 'lan1' 'lan2' 'lan3' 'lan4'
network.@device[7]=device
network.@device[7].name='br-wan'
network.@device[7].type='bridge'
network.@device[7].mtu='1508'
network.@device[7].ipv6='0'
network.@device[7].ports='dsl0.35' 'lan1.9'
network.@device[7].multicast='0'
network.@device[8]=device
network.@device[8].type='8021q'
network.@device[8].ifname='lan1'
network.@device[8].vid='9'
network.@device[8].name='lan1.9'
network.brwan=interface
network.brwan.proto='none'
network.brwan.device='br-wan'
network.brwan.mtu='1508'
root@7362sl:~# uci show wireless
wireless.radio0=wifi-device
wireless.radio0.type='mac80211'
wireless.radio0.path='pci0000:00/0000:00:00.0/0000:01:00.0'
wireless.radio0.channel='1'
wireless.radio0.band='2g'
wireless.radio0.htmode='HT20'
wireless.radio0.txpower='23'
wireless.radio0.country='DE'
wireless.default_radio0=wifi-iface
wireless.default_radio0.device='radio0'
wireless.default_radio0.mode='ap'
wireless.default_radio0.ssid='ssid'
wireless.default_radio0.key='xxxxxxxxxx'
wireless.default_radio0.short_preamble='0'
wireless.default_radio0.max_inactivity='600'
wireless.default_radio0.encryption='psk2+ccmp'
wireless.default_radio0.ieee80211r='1'
wireless.default_radio0.mobility_domain='9acf'
wireless.default_radio0.reassociation_deadline='20000'
wireless.default_radio0.ft_over_ds='0'
wireless.default_radio0.ft_psk_generate_local='1'
wireless.default_radio0.ieee80211w='1'
wireless.default_radio0.network='lan'