I installed a powerline network at my sisters house over thanksgiving, she would not let me yank cables through her new construction house so it was the only way to wire up her media cabinet directly to the internet.. Her WiFi situation sucked badly, We'd try to stream a movie and all would seem fine til someone had smartphone fever and did just enough to knock the video back into buffering mode.. No online video would play at all on TV if I had my laptop open and looking at home video feeds.
used a pair of these:
https://www.amazon.com/TP-LINK-Pass-through-1200Mbps-TL-PA8030P-KIT/
then mounted an UniFi-AC-Lite to the wall above her TV, then ethernet connected her PlayStation4 and SmartTV.. setup was simple and easy, performance tests showed about ~200Mbps performance across her house which is many times faster than her 40Mbit internet.. Online streaming is rock solid now and from her living room the WiFi now gave full internet speeds instead of 4-5Mbps her old access point installed in a home office across the house provided.
VMMV, but PowerLine can be a lifesaver in a pinch.. luckily she has a battery powered robot floor cleaner and built in house vac on the appliance phase so I dont suspect she'll ever have any stability problems in the long term.. Her house was done with all the lighting and outlets on one phase, and the appliances on the other phase, with modern service all starting at 200A its no surprise, but older houses are usally sharing a 100A service more conservatively.. perhaps a hairdryer will fuck with it.