I wanted a tool rack that would not interfere with my print height on my CR-10S Pro as most appear that they would. I ran across this wonderful design (https://www.thingiverse.com/thing:2607518), but it didn't have a couple of things that I wanted. I added spots for 2 MicroSD cards, scraper and a razor blade.
Additionally, I needed somewhere to mount the Creality clippers and a set of needle nose pliers. So I made a two plier rack.
Both of these mount to the top rail using tnuts and do not interfere whatsoever with the print height. These will most likely work on a wide range of printers including all of the CR10 series, the Ender 3 and any other printer using the aluminum extrusion for the top rail.