Strangest disagreement with the a client's family member who doubles as their "Computer Guy"?

I have a customer with 4 separate assisted living facilities. I installed IP Surveillance at each of them. They are pretty small, 5/6 tenants each and all in residential neighborhoods. Currently each location has its own NVR and a remote connection over the internet to my client's office for monitoring. Aside from the NVR, the internet at each location is only used for basic IOT devices like doorbells, thermostats and Netflix. At times, yes internet performance can be poor because that's just Comcast in Baltimore.

F0R SOME REASON, my client's brother-in-law who doubles as their "Computer Guy" is trying to convince them to get a EVPL package and a Dedicated Internet Circuit at the office which would route all the camera traffic to a single NVR over the private line and then allow the all of the Dedicated Internet bandwidth to only be used for Netflix.

I suggested getting rid of the ISP's Modem/Router combo and replacing it with a QOS capable router but they seem to be siding with the brother-in-law although they haven't received a quote form the ISP yet.

What would you guys recommend?