The one I just did had four keyhole slots on the back.

I ran four screws into the bench adjusting them so that I had to bang the plug strip onto them with my fist.

Then I ran a fifth screw in at the end so it could not slip off the key hole slots.

I say it is not 'permanently' mounted, it is just secured for the time being. wink

It simply plugs directly into a wall receptacle.

Bob Badger
Construction & Maintenance Electrician
Massachusetts