Here's a picture of the PHS with the brackets I built (including brass hot-set screw threads): View attachment 9731
It'd be pretty easy to remove the plastic block that's there for front-mounting, and then either (a) add holes for ~2mm long screw or (b) add a springy plastic tab that'll poke out into optical drive screw holes.
I am testing the sas version of this. With 3 2.5 10k drives connected got to 60C really quickly. Now I moved it aside until I can figure out a chassis situation. I'm running badblock tests and have one fan directly in front blowing into the cage and one on the other side blowing away.