Proper Amp and/or Splitters for Cox Cable w/Docsis 3.1 MOTOROLA MB8600

Hi, I have a couple of questions about signal/frequency ranges for Cox Cable, with either gigablast or 500 down/50 up (current).

Splitters - With the Cable Modem being Docsis 3.1, I assume the splitter should at minimum be a 5-1218Mhz (1.218Ghz) splitter, ideally it would be higher and cover the MoCA 2.x range and go to 1675Mhz.

I have a main cable receiver (Arris AX013NM) and two smaller boxes a PACE PXDOANI and a Cisco CXDOANI, along with a Motorola MB6800 Docsis 3.1 modem.

At the house I have a POE Filter->Drop AMP-Spliiters.  The Drop AMP which is a 102-1218Mhz Antronix mid-split (MRAM-1-15-G2), then to a Cox supplied Andronix CMC2008VC-A 8-Way 5-1002 splitter.

One of the 8-way connection goes to the Cable Modem.  3 to the cable boxes, 1 to a tivo (which uses a Cable Card + Ethernet and not MoCA), the rest are terminated with caps.

Questions:

1. Is this the correct Amp?  A mid-split seems correct for a Docsis 3.1 modem.

    Amp options are:
       Traditional 42/54 split with a 1002Mhz top end.
       Traditional 42/54 split with a 1218Mhz top end.

2. Should the splitter be either a Antronix 1218Mhz or Andronix 1675Mhz splitter?

3. Are the PACE and Cisco boxes Moca based IP from the Receiver?

4. Would it be better to get an Andronix combined 8(Cable)+1(Voip) AMP?
     Antronix 8+1 Amps