What are some ways (or what is the typical way) that a wall mount device mechanically and electrically attaches the AC blades/plug into a design? I've worked with panel mount IEC320 and cabled power entry in the past, but I'm curious what the common means of using NEMA plugs is. I'm thinking of something like the ubiquitous AC-to-USB power converters that are everywhere. Are the prongs molded into the plastic and then wire attached to PCB holes/pads? Do they direct solder the prongs to the PCB? What about in the case of foldable plugs?