Summary

Bracket which allows to mount 2.5" drive in 90 degree rotated angle from bottom mounts. Use some kind of stackers to to mount multiple drives (I used https://www.thingiverse.com/thing:582781 which does good job).

Also I added slight offset for my needs but feel free to use included Fusion 360 to customize per your needs. I used M3x3x4.2 brass thread inserts but again, customize if needed.

Need for this may be quite niche but e.g. stock SSD mountns of my Asrock Deskmeet x300 are unusable with power supply which has larger SATA power connectors as there are not enough room for connectors, however there are plenty of room if you just rotate and stack SSDs (they saved like 10 cents per unit by not including proper drive cage)...