Oh yeah, that's the other thing I forgot to mention. I believe the power brick the Google TV model comes with is only like 1.5 amps, so you'll definitely need a higher-rated adapter with whatever hub you get. You'll wanna check the requirements of the hub and the ethernet adapter and make sure whatever power adapter you get can support all of them at once.
Personally, I've had no issues using wifi with mine. I used to have it connected with ethernet when I would play games on Stadia through my Google TV, but that usually ran just fine on wifi, as well. Just keep in mind that you do need to be a lot closer than you would expect to get a good signal; being placed behind your TV made of metal and glass does a lot to interfere with the wifi signal, so I find that dongles like this tend to really not do well with being beyond the same room as the router, in a lot of cases.