Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5512381.

Model has been moved to Printables.com:

• https://www.printables.com/model/216652

The Koppla power strip from ikea (usb version) has build-in holes for wall mounting but frankly I think they would be destroyed when you unplug the first appliance and they can't be used for mounting it under a desk.

So, not much to add. Use 4x 4mm diameter screws or below.

Hope it helps !