How to safely store IEM receivers for travel

I recently purchased an in ear monitor rack. Obviously, the point of the rack is to keep things stored for ease of use and travel, but I'm trying to figure out what to do for the receivers. I have 3 Audio Technica ATW-R3250 receivers that I need to safely travel with on tour.

Do you guys have any recommendations for a case that could store them that I could squirrel away in my rack's storage drawer? Am I overthining it and I should just throw them into the drawer without anything and let them bounce around during travel? Should I store them separately and carry them around?

Also, on a somewhat related note, is it better to regularly unscrew the antennas to store everything or should I try to keep from doing that unless it's necessary?

Any input would be appreciated. Thanks for your time!