compatability with viasat isp

Hello, My isp is a company called VIASAT out of Carlsbad, Ca.

The viasat modem is junk. 

I cannot get a straight answer from Viasat ISP as to whether 

the Netgear coax cable, can replace the Viasat coax modem.

My 'hot-spot' provider is Verizon. 

I bought a Netgear MiFi device for the Verizon connection.

THEN, Verizon said they did not support netgear MiFi.

Then, I had to buy an inferior MiFi from Verizon.

How can I find out, now, for the Coax-router and before I

would buy a device like Netgear MiFi, whether an ISP

supports a netgear product, ?

How do I tell Viasat how to 'set up' the new netgear router

to replace the Viasat router, please ?

Thank you. 

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NETGEAR - Nighthawk AC1900 Router with DOCSIS 3.0 Cable Modem - Black