Since you've built out a new mesh network and confirmed strong signal distribution, Wi-Fi will work just fine for you. It's the older protocol versions (particularly before 802.11ac in ~2013) or if you have signal reliability issues that could create issues versus Ethernet.
I've set up multiple streamers, including Bryston streamers, with Wi-Fi to Ethernet adapters and they've all worked great as long as the signal was strong. The Wi-Fi SweetSpots app on iOS can be used for rough testing of signal strength.
Just keep in mind that for high-resolution Qobuz streaming to the Bryston BR-20, you will need to use the Manic Moose web-based interface. This is generally the case with other streamer hardware as well. When Roon certification is completed, then that would be another option for high-resolution Qobuz streaming to the BR-20.