I have to say that I find ethernet over power plugs not reliable (any make) and I no longer use them because modern beam shaping wifi is better, even in my old house with plenty of solid walls. If you have any dimmers in your home then in my experience things are even worse (even if the dimmers are set on 100%), not to mention mains transients causing things to briefly topple, or imperfectly screwed together mains cabling with the possibility of adding highly unpredictable spikes or momentary gaps. I have recently implemented a new wifi router, a TP Link VR900 v2 which has been reviewed as being especially good on 2.4GHz with standard wireless N adapters and I can only confirm the reviews: my Sooloos system has been completely reliable since the TP Link replaced my (Sagemcom) BT/Plusnet VDSL router.

Cinema/Music: Trinnov Altitude32 8-16,218,Cloud 4 channel, Marantz UD5007,DSP5200SE(2+C),DSP3300(4),DSW(2),271,MShort Ceilings,AppleTV 4K
TV: Marantz SR7013 Wharfedale Diamond 9x4+Celestion(C)
Music: Roon,i7NUC8gen,QNAP TS253A, Sony Scala, MS200, Garrard DDQ650,Wharfedale Diamond 12.3
Kitchen: AD88 (bluetooth via i80).