A 10x USB cable holder for up to 10 USB cables. Designed for the thickness of the IKEA IDASEN desk.

Two versions (one with holes for screws, one without) 

The first version, the one without any holes, can be attached with a few blobs of hot glue. It should hold just fine. If it comes off, re-applying some hot glue should hold it again for a long time. 

The second version can take up to 3 screws. 4mm diameter, 12mm countersinking for the screw head. 16mm length minimum. Ideally 20mm. More than that would be overkill.