Huh, I didn't even know that was a thing! This looks like a good option. Are powerline adapters generally reliable? (At least more comparable to Ethernet than WiFi?)
A good option? well..... if u absolute, definitely cannot run a proper CAT cable, and WIFI is not working out for you, Powerline is the next thing to TRY, there is no guaranteed, Powerline depends on the quality of your electrical system, so buy from somewhere u can return without hassle.
Lets get to the chase because seems like 95% of people who ask this question are gamers and gamers care ALOT about latency, and latency can only be fixed (1)having the proper PAID bandwidth (you do) and (2) An honest to God CAT cable, there is no other way, for GAMERS.