It’s usually the shortest (length-wise) card in any box, and since it is not designed to convert to low profile (wishlist!) w/ even a custom homemade bracket due to the obvious fact that the circuit board uses every mm of the height of a standard card; the height of the BMI Pro is its limiting factor in this case.
I have a few running in long 3u rack boxes (iStarUSA 3U Rackmount Server Chassis Front-mounted ATX Power Supply) that atypically accommodates standard ATX mainboards & an ATX PS2. (19.00″ x 5.25″ x 20.80″)
I’m guessing stepping down to a 2u box & micro-ATX mainboard is plausible w/ riser cards or you could just leave the lid off 😉 Coincidentally, w/ the exception of a risers refresher course & finding a suitable micro-ATX mainboard I can live with, I’ve set aside the other required components tested to fit into a road-friendlier, (iStarUSA 2U Rackmount Server Chassis microATX + ATX PS2), live streaming box generally the size of a 17″ notebook if its 2u width is disregarded (15.0″ x 3.5″ x 19.0″).
I’ve never built nor disassembled a 1u box, but I essentially eliminated it as a possibility since I’m pretty sure you’re forced into video(GPU) on the mainboard.