Help me understand the MoCA port on the Arcadyan NH20A and optimize my network topography

So my NH20A has a MoCA port, and it's connected to an RG-6 cable in the structured media enclosure.

The PVR is connected to the ECB6250 via Ethernet, and the other end of the adapter is connected to the Coax port in the wall. Is it possible to plug a switch into the ECB6250 so that I'll have additional Ethernet ports for WiFi or wired connections? If this doesn't work, can I swap the ECB6250 with this?

https://www.amazon.com/Adapter-High-Speed-Ethernet-Streaming-KB-M3-02/dp/B0DMFLBZZ5/ref=mp_s_a_1_1

Since the NH20A has a MoCA port, I'm assuming I won't need a MoCA adapter for it. I'm assuming I'll just need a MoCA adapter for the rooms where I'll need internet and TV.

If the room already has a Coax port and the TV works through it, then I'm assuming it's just plugging in the gear for internet and no other configuration is required?

What are the specs of the NH20A's MoCA port? Is it capable of 2.5GbE? What is the maximum number of adapters it'll support in the mesh?

If I want all of my STBs hardwired, can I use MoCA adapters to do that and keep port 2-4 of the NH20A free for other uses? Then I'll bridge port 1 for another router.

What do you guys think of this topography?