Does additional Mini need to be on Moca if existing Tivo and Mini are on Moca?

I have a Moca setup for my Roamio Pro and existing Mini. The router is not near the Pro so I have set up an external Moca with adapters at the the Mini and Pro using switches (other devices are attached to the switches like DVD and game consoles.



I want to get another Mini for another TV. Can it be connected via ethernet, or do I have to get another Moca adpater to run to the new Mini?



Is my Moca system efficient? I had Moca before I got the Pro and Mini (previously running S3 and TivoHD at those locations)



Thanks!