I use the multi zone, but do it via a MC600. I think Roon is a real upgrade to Sooloos, as it's more interactive. The integration with Tidal is pretty slick, but it seems like they are still sorting some things out. The app seems to go all wacko on occasion. In a perfect world, I don't think an iPad or Android tablet is ideal. Rather, a dedicated touch screen (as they have suggest) is likely really ideal.

I would add that more multi zones seem to weigh more on processing power, so your central processor should be robust. Also, it sounds like you might have a central rack. You will need to set it up so that the Roon server PC never sleeps.

Primary: MD600, MS200 (SpeakerLink to AES), Trinnov ST-2, Ayre V6-xe, Salk SS8 3x LRC.
Secondary: MC600 (whole house).
Zone one: 568.2, G57, MS200, Spatial Hologram M2SE.
Zone 2-6 (Awaiting assignment).