You should never plug PLCs into powerstrips (or any other cabled thing) - always directly into the wall socket. Fix that on all your PLCs around the house, and you'll see a massive overall...

Did the electrician by any chance install a "filtered" outlet? If so, then it filters out the powerline signal, rendering the outlet unusable for this purpose.

Sure ... you need one powerline adapter at the router, one at the TV, and another one (w/ builtin WLAN AP) in that 3rd place where you want wireless. I'd start with a 8630P kit plus a single 8010P....

Hi Joe! Yes, powerline is a good candidate to solve your problem. Looking at product maturity, I'd resort to the AV1200 line, the TL-PA8030P in particular. With the latest firmware, I have brilliant...