If you want to use these cams for that, I would use the SD card then use a “joiner” program to combine the 1 minute files into a single video per camera.
You can then use video editing software to use your visual cue to synch them up.
Whether they’ll still be synched after an hour, I can’t say, but as long as they have a time source/internet connection, one would think they’d be pretty accurate. But as @K6CCC says, these cams aren’t really designed for this, they use high compression and are just inexpensive recording devices so I don’t think millisecond accurate precision (which over the course of an hour can become seconds) was accounted for in the design.