eero 6+ mesh wifi system

They do make a powerline with a pass through power so you could put that on the wall and run a powerstrip after it. But IME a 3node Eero will probably perform better for you.

That router has 10/100 ports so you aren’t even getting your 500 to throw up to be honest you can get an Eero 6+ for like 80 bucks and it would be way better than what you’ve got now

Eero is also good and is on sale Amazon Prime day. I used Eero 6+ . I use Ethernet cables on computer, printer and TV. and also have Ethernet to each Eero access point. Ethernet not required but is best.

Mesh. The kits often come with 3 nodes. One or more for each floor I use Eero but others will also work. That may fix it but if not see if there is a chase between floors for pipes so you can run Ethernet, one cable to each node on each floor

Yep same I have 3 x Eero 6+ in a long old double brick semi and it works a treat. No need to hardwire anything. I used to have TP-Link but the Eeros are much easier to setup and more reliable.

Have a look at the Amazon Eero 6+ as it works very well on FTTP connections.

Most of my home clients I get them a Eero 6+ They are essentially idiot proof and while not as customizable as MicroTik the average Joe the Plumber types will do better with this that frogging around with settings they don't understand.