I stuck my Diamond plates to a piece of 3/4" plywood with a cleat on each end.
It is a friction fit with my "low" bench.
If I need better access to a plate, the board can be flipped end for end.
Dunno about dry honing, I raise plenty of swarf with the soft steels I prefer.
A dry plate would likely need cleaning, at some point - would it not?
Even the hardest materials can glaze, and stop cutting.
If the topmost layer is particles of the steel you hope to sharpen,
won't the edge just skate, rather than abrade?