Mount I made for my Amazon Basics Power Bar. I designed it to be low profiler and have a small footprint while still being sturdy enough that I can pull the cord out of the power bar without worrying about it moving. The countersunk screw holes should fit normal #6 or #8 wood or drywall screws. I made the middle piece to help keep the bar aligned perfectly while I installed the other end of the mount, so if you want to safe on filament and aren't as picky you can skip it. 

Install the small piece which holds the bottom of the power far first, along with the middle piece if you're using it. You can then put the cord in the slot on the big mount, slide the mount into place and install the screws. If you use the middle piece you will have a free hand to put screws on the end of your drill.

Enjoy!