Port Forwarding to Support Multiple Gaming Consoles?

My household has several XBox One gaming consoles and I've recently switched to the XB6 gateway.  My understanding is the gateway does not have / support UPnP, so I will need to setup port forwarding to allow the devices to work correctly (voice chat in game, etc).

Is there a guide for setting this up for multiple consoles in a single house / wifi network?  The drop-downs in the XFi app are only good for a single device in this regard.