Roamio base cannot create a MOCA network, only be a client of it.
But if you had MOCA going, yes you can have some Minis connect though
MOCA and some connected through cat5 Ethernet. Everything would work just fine.
Roamio Pro, wired ethernet
Mini using MOCA (from the Pro)
on Cablevision Raritan Valley system (Central NJ)
w/ Cisco PKM803 CableCARD on firmware 18.104.22.1681
*** 2013 newbie to Tivo ***