Might want to start here if you have not already read this stuff:
https://roonlabs.com/howroonworks.html
https://kb.roonlabs.com/
ROON works best over Ethernet, however you can use WIfi also. comes down to how much DSP you will be using and how good the WiFi is. I run a cable from my den out to my living room as Wifi for me was not the best.
The components do not have to be in the same room just on the same network. see links above for details.
There is also a good video overview that Hans did here: