Networked audio is one of those unusual areas in which you’re really not better off solving a problem at its source; it’s better to address noise as close to the streamer as possible.
Hmmmm, I’m not sure I follow your logic there!
Whether a switch used for audio is "audiophile" or not is actually less important than where it is! If you want to use it to kill RFI noise ... it needs to be the shortest possible length of cable from your streamer (say 1ft to 3ft).
Again, I don’t see the logic there. I’ve found routers and switchers to be more a source of RFI than a remedy. That’s why I try to keep computer stuff as centralized as possible and away from my audio system, which includes both analog and digital sources.