Adguard Home: blocking some devices to services that are available for other devices

Use AdGuards script and the edge build rather than OpenWRT's opkg version. Also you need the 20.02 RC or you need to get full SSL install as you will be lacking the required SSL librarys on 19.07

Also per device or per group blocking can be done as per here : Clients · AdguardTeam/AdGuardHome Wiki (github.com)