No way would I use that push-in USB device unless it is UL listed and approved under the NEC. I doubt it is.
A typical RV type receptacle is below. They do not have screw terminals on the side. The cover plate pushes onto the front via a couple of plastic tabs. If you have insufficient wall depth for a residential side-wired recept. with USB ports and outlet box, you could possibly use a shallow box and a surface mount extension like in 2nd photo, which you can find in bathrooms in RVs for GFIs.


