Adding network camera

Hello,
I am looking to install a video surveillance system under HA and MotionEye for 3 stores with a raspberry.
I already have outlets, sensors and security systems with Tuya and Verisure in HA

I would like to know how to add a camera that is not on the local network.
I was thinking of Tuya, but the video streaming is closed.
Do you know a camera brand/model that would allow adding cameras from multiple networks without having to open ports?

Thanks in advance
Jeason