Shelf Mount for Cheap DC/DC Power Supply

First saw these on [hack-a-day](https://hackaday.com/2016/12/08/absolute-power/). These cheap ($30ish) DC/DC power supplies are readily available on [amazon](http://amzn.to/2i3fRQg), ebay, ect. These units come in a variety of specs so make sure you get one that will work for you. They require you to come up with your own enclosure. I opted to hang mine from a shelf overhanging my desk. I wanted this to be modular so I could keep adding them across.

This version is getting DC in from a 12v s