The touch plate does not work plugged into the controller, it needs to plug into the small display. The system does not see the touch plate plugged into the controller but works just fine when plugged into the small display unit.
Depends where you want the z zero to be. If you have z zero set to Material Surface then a touch plate is placed on top of the material. If it's set to Table Surface then it's placed on top of the spoilboard.