dual 5g internet use

You can run an app like “WiFIAnalyzer” and see all the channel assignments and SSIDs being used by the routers.   By the way, even if the routers are broadcasting on the same channels, it isn’t the end of the world.  I believe they “cooperatively share” the channel when that happens. If there is a demand on only one router at the time, then it shouldn’t really matter.   I’ve read that this is actually preferable to being on adjacent channel numbers, where you can get destructive interference.  If you assign channels manually, they should be kept pretty far apart to avoid this.