One option I have considered for large drying screen racks is to pierce narrow wooden frames or plastic frames with enough material on them, with corner holes large enough to thread Paracord or slightly larger nylon cord through each hole, with the top of each cord hanging straight down from a celling eye bolt or hook or gig, and using small but strong one inch plastic spring clamps, starting at the top screen lower the screen down about an inch or two, and clamp in place, with a clamp beneath each frame hole, so it can dry hovering out of the way, above the limited floor/fixture/benches.
Simply place each screen in a similar way, and underneath the last batch of prints, so no water is dripping onto partly dried prints.
When no needed, the screens can be raised up in a stack, without clamps or spaces between each rack.
The cords, when clamped just below the bottom frame, can be likewise coiled up and clamped high up on the stored frames.
Using six frames, with a spacing of two inches between each top drying surface you should be able to keep six frames in 12 inches, plus your support hardware distance, from the celling, which could be more than enough drying surface for most darkroom work, but, of course, you can use larger frames or more frames than the six I suggested.
After considering and rejecting the use of the limited space beneath my eight foot long enlarging bench, I decided to use more of the unclaimed celling space for the drying task, with my Thomas Sodium safelight and my fabric clothes closet that draws up to the celling when no in use, already up there.
Harbor Freight sells micro spring plastic clamps, as well as small, medium, large and extra large clamps, at good prices.
If micro or mini clamps do no hold loaded frames well enough, just move up to the next size, until you find what works for you.
Cheers,
Eli
