Simple cable clips that clamp between wall and desk. Parameters may be customized in onshape.

#tableThickness - stl has this at 34mm
#cable - diameter for vertical clip

https://cad.onshape.com/documents/a429d7579feb78c7614fbe97/v/9e59944a56e2fc5fab04c405/e/8891b28ba82bb0b39e852f99

I recommend at least 3 perimeters on horizontal clip.