I have the follwing setup in my house (three locations) and installed another one again last night for my in-law's new smart TV / blu-ray setup.
The configuration I use does not require "pairs" of MoCA adapters within the context of a Verizon FiOS household.
For mine, I utilized the Netgear MoCA COAX-Ethernet adapters:
http://www.netgear.com/service-provider/products/powerline-and-coax/moca/MCAB1001.aspx#To configure:
At the coaxial wall connection where you are wanting an Ethernet drop, I connect the input side of a bi-directional 2-way splitter, to the coax wall connector (5-1000MHz is the frequency you want).
Notes: do not use coaxial amplifiers anywhere upstream as they can block the necessary frequencies to support the TV signal, as well as the Ethernet signal.
If you wish to keep it "clean" at the wall, you could use one of these types of splitters instead:
http://www.amazon.com/gp/product/B004QQ1RQU/ref=oh_details_o02_s00_i01
From the 2-way coax splitter, one of the output feeds goes directly to the Verizon FiOS set top box. The other output feed goes directly to the MoCA adapter "Coax In". I do not use the "Coax Out" connector on the Netgear MoCA adapter.
On the Netgear MoCA adapter, there is an Ethernet port. You can either plug an IP device directly into this port (e.g. TV, blu-ray player, streaming device such as a Roku, game console, etc.), or you can plug in an Ethernet hub to provide more ports. If you use an Ethernet hub, there is typically a designated "Uplink" port, or one of the ports to make this connection (see manual).
I also use a MoCA POE (Point of Entry) filter on the main Verizon feed coming into the house (the coax coming in from the "street", that goes into the Input side of the main coaxial splitter in your house). You can find a POE here:
http://www.ebay.com/itm/271117885254?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649Mode links to help you here:
http://forums.verizon.com/t5/FiOS-TV-Technical-Assistance/Splitters/m-p/7106/highlight/true#M3644 (discussion on correct splitters)
http://www.dslreports.com/faq/15984
http://www.mocalliance.org/
http://mocablog.net/
http://www.extreme-broadband.com/training.php
Hope this helps!
