Multiple smart TV's not connecting - most others work fine (wireless and wired)

Hello,

Having some trouble with wireless connection with a few smart TV's. Originally had Google WiFi in the house, but that didn't work as expected. Ended up buying three new Netgear routers (in simple drawing below) and put all in AP Mode. Their respective WiFi channels are also listed below:

The main issue I am having right now is that none of the Smart TV's in the house are connecting to the network. Occasionally, wireless phone have speed issues (seemingly channel interference), and other times they don't work period. I am no network person, but from those I've talked to have said that setting these three routers up in AP Mode, and using the WiFi channels above should work fine. Also, the reason the Xfinity gateway WiFi is disabled is due to super poor signal from it - one of the new Netgear routers is a few feet to the side of it.

Would anyone have an idea as to the issue here? Again, I apologize for the amateur network knowledge. Much thanks in advance!