Carpentry, lowering baseboard.

If its a newly renovated room, I would be calling everybody back. Move the outlets up and re-do the wallboard. But it is a cool solution. Much better than hacking a chunk out of the baseboard - which was done quite often. As for outlet position, they put them wherever they wanted. LOL. Have seen plenty in the floor on old houses. Often added long after built. Place I lived in Scranton PA was originally gas lighting. Wiring added later. Plaster over slats. Lotta fun to work on.