Finally taking advantage of their 3 month 2$ offer I installed Roon server 1.8 (2.0 was not compatible) on my late 2009 MacMini/8GB RAM/SSD.
I use two end points:
1) Rpi3b/ropieeeXL/Allo_Digione
2) Rpi4/4GB with Roonbridge enabled on Gentooplayer (Diretta Host) and second Rpi4/2GB for Diretta...