instead of ears, you can use a shelf and put the unit on the shelf that mounts to the rack.
Yes, but it will shift if let’s say I want to move it from my storage unit to my future residence.
I moved a few months ago and needed to move my rack which now has a couple of pieces of gear that sit on shelves instead of screwed in with ears.
I went to the restaurant supply store and bought a 1000' roll of 18" plastic wrap and wrapped that sucker about 50 times after tucking bubble wrap in the empty spaces. Easiest rack move ever. When I got to my new place I just used a razor knife to take off the plastic et voila!