To me that is a 3 gang plate
the switch is using 1 gang as stated
the dimmer is using 2 gangs
You can buy whatevever combo you want
Even If you buy mk, a 3 gang grid can only take a single width switch and a double width dimmer
the switch is using 1 gang as stated
the dimmer is using 2 gangs
You can buy whatevever combo you want
Even If you buy mk, a 3 gang grid can only take a single width switch and a double width dimmer