OK, so this is just a hack / proof of concept, but why not make Gridfinity a little more vertical-friendly?

Here's a 5-single-unit Gridfinity part bin, holder.  It takes up the space of three horizontal bins.  The bins are at 45 degree angles, but I've had good luck with full bins still hanging on to their parts mostly.  I kept the sides trim, so that you can stand more up next to each other.  Would be super easy to widen to support 1x2 bins (just scale in slicer).

Please expand / improve as you see fit, this is just a quick one afternoon test!