Thanks for all the good replies here! I think I will then use only one XLR mono signal from the kemper. As for monitoring, I was thinking they probably have some on-stage monitors that are connected to the table, thus not much for me to think about other then adjusting the levels correctly.
Also, how are you monitoring? Are you using any cabs? As yours in unpowered, do you have a powered cab at all? I would not rely on an in house monitor if you can avoid it.
Why would you avoid in house monitors?