Since you have 2x mac laptops, I would probably recommend getting our USBC KVM instead:
This KVM will charge your laptops as well as display and send USBs in 1 wire. Just be aware of how you should connect everything. In the diagram below, the MAC is connected via 1x USBC and 1x USBC to DisplayPort Moshi cable.
In your setup, you will need per MAC:
1x USBC to USBC (for the bottom port)
2x Moshi USBC to DisplayPort 1.4 cable (for the middle and top port)