I am not sure about the new OG Cams or the PanV3. I haven’t read yet if someone has tested installation on an open network.
I do know that the V3 Pro does NOT like open networks:
If the cam is a wired cam, like the V3, and is compatible with an open unsecured network, there is no “base unit” needed. The only requirement when you install is that your phone must be logged into that WiFi network. Once setup and logged in, you can access it from the app anywhere your phone has internet.