This mount will slide over the streamdeck+, then slide the MK.2 into the top and then cap it off to finish the look with the top piece.

Added spots to be able to place 1cm wide circular magnets for a more secure top but its not needed.

Printing flat on its face I was able to do so without any supports. I found this worked for me because I used a smooth plate, however if yours is textured you may want to reposition the model so you don't get the textured look on the face if you don't want it.