Mount for SUPERDANNY extension / multi plug

I recently purchased this SUPERDANNY extension / multi plug (https://www.amazon.ca/gp/product/B07PMGR4KZ/ref=ppx_yo_dt_b_asin_image_o01_s00?ie=UTF8&psc=1) and discovered that it does not have any mount holes on the underside.

I did some measuring up and this is my first attempt at it.

I printed this with minimal infill and added supports for the holes as my printer is not perfectly tuned yet.

Simply print two copies, slide over each side and mount to the target surface.

UPDATE: Version 1 of the design did not include counter sunk holes and the two outer USB ports were unusable. Version 2 alleviates these deficiencies.