This model was inspired by the original model by Steve5092, but recreated from the ground up. OP had the best one I have seen online, but was missing the wall mount for the new “wide tooth comb” adapter (yes, that's the official name from Dyson :D). I have also made the magnet holes smaller for my 8mm wide round magnets. I put a stack of 2 magnets in each hole, but it's up to your preference on how strong you want the magnetic connection to be.
The model is printed easily with no supports, I printed mine with PLA and 0.2mm layer height. I have thought about creating one with embedded magnets with a pause in printing, but this is a much simpler solution and you can choose the ammount of magnets you put in the holes. My recommendation - put the magnets in the holes, attach the Dyson adapter and rotate it a bit so that the magnets settle in their natural position. After that put a few drops of superglue in the hole and spray it with super glue accelerator so that it solidifies instantly. Then you can fix it to you wall using a double-sided tape.
The author remixed this model.
This model was inspired by the OP's work, but has been recreated from the ground up in CAD. Fits the new Dyson Wide Comb adapter and has smaller magnet holes for the 8mm magnets.