Harv, these things don't screw to the rack itself. They are only 8-10 inches wide and meant to lay flat on a desk. These slanted desktop racks are tilted back maybe 8-10 degrees, so those things would slide right off unless they are tilted back to front. I mounted one of them tonight. I cut wooden wedges that actually look like door wedges but at a steeper angle, and screwed them into the shelf. I still need to do some velcro to hold the synth to the wedge but the alignment is right. I'll do the Korg tomorrow. Since these won't leave the house I can get away with low tech engineering.

Photo tomorrow.