Hello Ray,
Have you tried the example described in our “Build ESP32-CAM Projects eBook”?

• PAGE 338: Unit 6: ESP32-CAM IP Camera Access from Anywhere in the World

The best way to access multiple cameras would be with Ngrok and Node-RED, but it also should work with port forwarding.

I am using the RNT code that has the “start” and “stop” button

Hello again, if you do a proper router port forwarding, you should be able to open any port for any ESP web server, but unfortunately the configurations for each router is slightly different…

So I can’t give you an accurate answer on how to do it for your specific router.

But have you considered using the method described in?

• PAGE 338: Unit 6: ESP32-CAM IP Camera Access from Anywhere in the World

This example is very reliable and you can use as many ESP32-CAM board as you need to.

Thanks!