It took sorting through their site to find the actual security they offer. For fiber or others it can be McAfee, but they target the fiber modem with something called ActiveArmorST. And it seems to want to only protect its own named network. It sees one "Device" that is my passthrough router that the entire network runs on. Does this bode well or ill for everything that comes through the router? I think I'm going to turn off the feature and look for a standard antivirus.

Talking to tech support is always more helpful than talking to sales people. It still seems that the apps on the phone are the main way to turn things on and off (I had to use the phone to turn off the ActiveArmor). She agreed I'd set it up correctly for the passthrough, so I think I'm good to go and will set up the separate ID I need to get their McAfee and see how that works on the computers.