Print one for every 15-30 cm under desk, pull velcro cable ties through, latch, done. Easy to redo, add, subtract cables to/from. You can mount it with screws or with double sided tape.

Depending on your amount of cables you can use the different sizes - or two single holders and space them as far apart as you want.

Printed in PLA, but you might pick PETG for especially thick cable bundles.