That 60% keyboard is a bit of a special case in that the plate is there purely for look and feel. It is otherwise a PCB-mounted keyboard. That plate is suspended from the switches on a PCB that is mounted to the case.
On most other plate-mounted keyboards the metal plate is instead the load-bearing element that holds the switches and then the PCB is suspended from the switches underneath, often without touching the bottom of the case.
BTW, it was said above that Uniqey's QMX silencing clips don't work with a plate. Zeal PC has silencing clips that do, but they cost twice as much. Also, both types of clips have to be used with the LED window facing south if you are going to use thicker keycaps.