I recently tried out VincentGroenhuis' awesome Universal Auto-Rewind Spool Holder,
but didn't want my stands moving around.
When using other screw-down stands, I found it hard to keep the spools from rubbing, and I had to be very exact where I mounted them.
My minimalist stands use little plastic, print flat, and will work on a table, ceiling or wall. Note you'll want the "round" version, which reuses the Prusa supplied metal poles. Currently the files are SpringRound.stl
I'm also including a small assisting jig I made for mounting.
You may want my screw down bowden tube guide: https://www.thingiverse.com/thing:3474310
Paying attention to face them the same way, you can snap the guide on the legs in order to keep them spaced correctly, I recommend inserting the pole you intend on using when bolting it down.
Make sure to press everything together and keep it square, it should be fine.
Temporarily add helper to keep frames square and correctly spaced.