I guess the only workin setup is to make the new Netgear the main route, DHCP and DNS for every device in your house. Otherwise you cannot do actual load balancing.
The respective LAN ports of both of your existing routers need to become WAN ports for your Netgear.
If you want to have 3 AP devices in your network, however, they need to stay LAN of your network.
- Make sure your existing routers span individual subnets.
- Disable DHCP servers on both of your existing routers.
- Just wire a LAN port of each of your existing routers to your Netgear.
- Create two distinct interfaces on your Netgear, both on eth0.2 (so the router expects both to be plugged into the same vlan segment), both of type static. Make sure one is in IP range of your slow Uplink and the other one in IP range ofnthe fast Uplink.
- Now use those new interfaces as source for mean
That, imho, is the only way you can use your existing routers both as uplink one one hand and keep their AP feature intact on the other.
Adding a couple of vlan aware switches somewhere won't help at all. You would have to make vlan decisions not on the wire but within your existing routers (meaning: Both, LAN and WAN would need to leave the existing routers either on individual ports untagged or on a common port tagged) which is not possible with original firmwares of your existing routers.
As for the TP-Link vlan switch: stay away. I have two of those, they are crap. Management can only be done on vlan1. Vlan 1 is always assigned to all ports (so you cannot unassige it), which results in management being always possible on all ports. And there's no web ui but only a windows-only Java client. So it's useless in terms of security and unmanageable on Linux and OS-x. As long as you only want to separate home use IPTV that's probably enough, but for everything beyond that just not enough.