If you want to store a plane upright, then depending on the shape of the plane, make:
A simple upright box sized for the plane, but an inch or so over length. Put a piece of ply across the top, and another across the bottom.
Push the toe of the plane up under the top 'guard', push it back and allow it to settle down behind the bottom plywood 'guard'.
Just like you mount a sliding door. The top 'guard' might need a slot to accommodate the front-tote.
The plane couldn't fall out, unless you dropped it! I've seen planes stored on the heel, and never heard anyone say the casting suffered for it.
Store planes without a projecting toe and heel horizontally.
Or if you only have two planes, as does Mike G, just put them under the bench!
Does that make sense folks?
John