Adding Cameras on different WiFi.

I have a Ring door bell and a Ring security camera and pay for the protect system. My door bell is on my main wi fi. The security camera is on an extender. I keep my car in my In-Laws garage and want to put an indoor security camera on it in their garage. This would be on a separate WiFi. Can I do this and just add the camera to my account so that I can monitor all three cameras on my phone?