My modem/router mesh system is set up the same as mitch2 in separate rooms with a few differences. I use the latest xfinity combo modem/router with no issues for the same finger pointing reason as ghdprentice after having different brands. I currently use a Linksys Velop mesh that is about 3 years old with no issues in a difficult home to cover. I also use Linear power supplies, an EtherRegan switch, have optical isolation and a Stack Audio Smooth installed at my streamer. Sooo many good ways to set your streaming up. Good luck with your set up!
*One other benefit option of my xfinity tower is you can set up a second network which I do for my second system. Each system is on a different network.