I have a BDP -pi
If you look on the lower left corner of the MM Dashboard you will see a button that says Playback. Its a dropdown and if click it you will see "Roon Ready". Just select that and MM shuts down and ROON will show on the display. Now when you fire up a roon core and go look for endpoints you with see the BDP. Thats all there is to it.
I dids the The Roons (TR) trial on a iMAC to test it. MM sounded better than TR . Then I bit the bullet and got an SGC ST i5 and rehosted TR Core, Upgraded my cabling and now TR sounds as good as MM. Except for the Radio Paradise app in MM. RP still sounds better streamed from the app withing MM than TR.
Note: I also put a mesh wifi in my house and put one of the nodes next to my rig and hardwire the i5 and the BDP. Dropouts are rare
Do the TR trial and fill us in on what the SQ results are between MM vs TR.
There still is a fair number of users out there that think that MPD (music player daemon) inside MM sounds better than TR.