Modeled in Fusion 360, I wanted a minimalist mount for my wife's Dyson Super Sonic. We mounted it on the back side of the door of one of our cabinets. The mount is designed to hold the device off the door and prevent it from swinging back and hitting when the door is closed/opened. I put it on using two command strip pads, but you could drill and use screws if you'd like.
The mount will work with the Super Sonic facing either direction. The hair dryer itself is not symmetrical front to back, so it overhangs slightly in the front but lines up perfectly in the back. It works with or without the thinner nozzle attachment on (this is the only one my wife uses, so I didn't bother testing the other two).
I printed this at .1 layer height with 35% infill - but it doesn't necessarily need that much. Set it up in your slicer so its layer flat on its back.
I printed initially in PLA and it seemed like it was scratching the finish on the Super Sonic, so I printed another one in PETG (which seems much smoother). I also went around the edges with some sand paper to get rid of any sharp spots.