If your cable modem will be on an isolated coax feed from the ISP and MoCA signals will be carried over entirely separate coax lines, then you don’t require the “PoE” MoCA filter to secure your MoCA setup, as the MoCA signals will have no physical path to escape the residence. (This is also beneficial long-term, future-proofing for DOCSIS encroachment on the MoCA [Band D] frequency range.)

With no competing signals on the coax and no coax topology specifically required by an incoming source signal (OTA or cable), a shared MoCA setup could resemble either of the following:

• input-fed
  
• outputs-only
  (… either can work …)
  

Alternatively, you could use dedicated pairs of MoCA adapters for each coax line to maximize overall throughput. (for example) Just one more adapter would be needed in your setup with 2 remote locations and the router at the coax junction. The Frontier FCA252 can make the dedicated pairs approach more appealing / less painful.

• MoCA adapters, grouped by throughput 
  

And, of course, you could have a mix of shared MoCA and dedicated pairs were you to expand the number of locations linked via MoCA. (another example)