Temporary or Permanent?
Temporary solution is to by "D" track and mount it on the wall. I have my two FE's mounted that way then roll them out for use as needed. Can't use them easily while strapped down..the strap goes across the front.
Here's a photo. The two tracks going horizontal are "D" tracks. Some put the D tracks in the floor. I keep the floor free and they work great on the wall. I put 2 3" straps. One middle, one low. Lock the wheels and the FE's never move during transport.