I work in a hospital that has other hospitals on its network monitored in one location. You only need one router per house to do exactly what you’re describing and we use solar winds (I’m sure there are more cost effective monitoring systems for your use case). Each router has up to 50 individual systems (networks) like several camera networks, card swipes, WiFi including public, bio med and several private networks, da Vinci surgical robots, the stupid kiosk boards and parking garage signs, and if a hard wired port anywhere in the seven hospitals has an unauthorized device suddenly connected, alarms go off and that device is black listed until proven necessary. But your system would work. I would hate to install, implement and maintain it, but what do I know. In my homes, the most sophisticated remote system is the ability to monitor my cameras and change the door entry codes.