@AlexCoxie If you set the PX50 in AP mode like this (powerline backhaul instead of ethernet backhaul): and all the PX50 are on the same electrical circuit it should work - check this deployment guide...

@RickMo You could set WAN IP address as Static IP like this: For the second WAN you could use the same settings but with a Static IP address of 192.168.100.254. I think that's worth testing. As for...

@tapo_user2022 No, that's not possible. When port forward in a TP-Link home routers it will allow access to this port from any external source.

@SEBAST1AN I've never tested this but you could: Here's an example for configuring 802.1Q VLANs on easysmart switches (I assume you have TL-SG108E).

@RickMo As I think of the ER605 WAN ports IP addressing, If you set ER605 WAN1 and WAN2 with different IP addresses within the 192.168.100.0/24 subnet this might work as expected.

@SamSavage Have you tried to set TL-WA801N LAN IP address as "Static IP" instead and then disable its DHCP server: