Instead of mounting the boxes face down mount them through their sides so that they face out. That's what I did with my ceiling DC unit.I was concerned about vibration. Of course seeing as the power to the table saw will be mounted on the ceiling , twist kicks would make sense .
But it’s more than likely overkill on the DC .
I was going to use a twist lock on the cnc spindle though . Just for piece of mind , and because I have two.
Edit . Herb , almost forgot , the DC will be controlled by an IVAC system . The control box for the IVAC goes to a contactor in a separate enclose that will be plugged into the wall with a twist lock .
I tried the IVAC without an external contactor , and it kept on tripping its breaker because of the inrush current