As has been already said, create a group. Any cameras in the group will be displayed when you open the group. WCOs will show a play icon, they do not automatically play. My V2 automatically plays.
Well…I might be out of luck with travel mode. It requires me to connect to the camera’s WiFi and each camera in travel mode has it’s own WiFi channel. Can’t watch them together in a group.
Would have to disconnect from one and start the other.
you may be able to do something like this: LifeHackster. I subscribe to this channel as he has some interesting takes on things. the link provides a method of potentially doing what you are looking for, but will require for you to purchase 1 more item.
Have you tried doing travel mode from the base station, not just the wco itself? I haven’t myself, but that may help you connect to multiple at once. Scroll to the bottom half of this page:
Inverters are cheap. Just don’t let it run too long without the motor running. A little math will give you an idea how long is safe. I suppose you could also just feed it 12 volts DC straight with a little cabling work and optionally a second battery pack. Here’s what the site shows as the power input.