CC 2018 is working fine on the Mac network using Synology NAS RAIDs.
We converted one nMP for testing and so far so good.
However, we leave all the major projects on one that works and so far were at CC 2015 on 2 seats and 1 with CC 2017.
Those are fine too.
I learned my lessons with Avid as far as updating too quickly.
Were still two versions behind with MC.