This remix utilizes a Lite Multipoint Rail to allow mounting the holder flush to the Multiboard if you use two Lite Multipoint Screws. Alternatively, you could use a Pegboard Click - OXO Rail Pop-In or an Offset Bolt-Locked Insert - OX Rail Pop-In for mounting.
Print the model in the orientation given in the STL with snug auto-supports enabled. I printed this in PETG w/ 0.4mm nozzle and 3 perimeters for added strength, PLA would work as well.
The author remixed this model.
Removed through holes and replaced with a vertical Lite Multipoint Rail