I've just bought a Gigabyte M27Q monitor. This monitor supports display over USB-C whilst also featuring a built in KVM to allow me to plug the monitor, keyboard and mouse into my laptop with a single display cable.

This feature works absolutely fine. The only issue is that the monitor doesn't provide enough power to charge the laptop. However, as soon as I plug the AC adapter in the other USB-C port seems to get completely disabled, I lose the display on my monitor and cannot use my keyboard and mouse.