Cubicle Clips
This object is designed to firmly clip onto the metal rail across the top of a standard cubicle wall. It should click into place and fit very snugly. Once in place, you can hang objects off of the built-in hoops.
This thing was made with Tinkercad. This object is easily modified. I have used it to vertically mount very large 3D prints above a cubicle wall. Edit it online https://tinkercad.com/things/3HLSlZT0OqC
NOTE: It is critical that the object is printed on its side. Because the clips bend slightly before snapping into place, the bend cannot be parallel with the layers or it'll break.