Using Roon Rock installed on a NUC connected directly on (the main) Google Wifi router. I have 3 other Google Wifi points in the house, very strong network without problems but with the M11.
Never had much problems running Roon for streaming to my Pixel 3 phone either (with DragonFly Cobalt) although apparently because it is Android I can’t get MQA nor HiRes to my ears with Roon, for that I have to use another app… A bit of a shame, I wish Roon would work better on Android devices.
Device setup is default (no MQA), nothing special.
I think you should do your own tests with Fiio M11 (and Pro) defects will be obvious.