After a bit of hunting I decided to make my own build plate caddy.
This one provides support at the top & the bottom so that if bumped or knocked over the edges of the build plates don't risk getting bent.
You will need 8 M3x20 screws to assemble this model.
I've included a STEP file in case anyone would like to make their own version.
The version photographed had a few small “bugs”, the version in the 3MF should be easier to build & print.
Updates:
The author marked this model as their own original creation.