I created an attachment for desktop posts from novus (and probably other brands) for cable management. I needed to mitigate the problem that the cable of my mouse was slipping down the desk every now and then, which lead to me needing to pull the cable up again while using the mouse.
I created an attachment that slides into the mount post. It can hold up to two cables at once (thinner USB cables may still slip but are less likely to).
To get a better Idea how to use this, please have a look at the photos.
Size of the knob that goes into the post:
Width: 18 mm
Depth: 7 mm
Height: 25 mm (should not matter much)
Freedom of front plate to knob: 6.4 mm
for more measurements, see pictures
I set the support angle limit to 85° to get nice small supports that can be cut out easily.