Hi IamFodder - thank you as well for your reply. I will try to provide more detail. The two rooms with C4 controllers are the main family room and primary bedroom.
The cameras and DVR have not been selected yet. My plan is to have the DVR installed in the AV rack. I don't know how it will be connected to the network. In terms of the rack itself, it will be small - only containing a power supply, the modem, a 24 port switch (possibly two of these), a network controller for 3 WAPs, a router, 4 sonos amps, and the HIK DVR. But I'm not sure how exactly the DVR will be connected to the network.
The EA1s are located at the two TV locations.
Not sure if this helps?