All credit goes to jodoll and his Parameterized Power Strip Mount. 

This is a fully parameterized mount for power bricks and strips ! 

Create brackets to mount via the ends of a power strip or a strap that will cradle any rectangular object. Fully customizable in OpenSCAD. Screw holes can be adjusted and countersinks created (or not).

Useful for under desk cable management as you can see in the photos. 

Provided has several examples of what you can do. Recommend you use the SCAD file to make your own before printing.

To customize, you will need OpenScad and the dimensions of your power brick (just measure them but account for a little clearance, .5mm worked for me). Then get the .scad file, open it and fill in your dimensions at the top. 

All dimensions are in millimeters.