@soix I will do this and report back when I find some time. However, unless I am completely mistaken, the Eero mesh does run over wifi (and not power lines, unless you use an adapter, and I am even more suspicious of those). Of course you can daisy-chain eeros together with ethernet, but then we're back to ethernet anyway.
Anyone else with experience of Eero mesh over long distance for audio? The big advantage, of course, is that WiFi would not carry electrical noise.