@garebear, my music server/streamer is a simple Roon Nucleus that I use to stream music to wifi speakers, my dedicated headphone setup which is hard wired of course, and other Roon Ready devices that we have all around our condo, from our patio deck to the bedrooms, the living room, the kitchen dining area, an upstairs loft, and to our basement, all at the same time if we so desire. All you need is a wired Ethernet connection for the Nucleus, but after that it’s super simple to use WiFi through the Roon app.
I learned about the Nucleus from my stereo guy who uses one at his store so that his customers can demo several audio systems simultaneously by just using an iPad. He regularly puts together high end audio systems in giant McHomes for rich folks who think nothing of dropping $250K and more on audio gear so their homes have music in every room. Yes it requires a Roon subscription. But the cost breaks down to about $0.50 a day, which to me is pretty cheap.