Under cabinet or shelf phone holder. 13mm deep tray.
STEP file added for your remix efforts.
Uses (8) 12x3 rare earth magnets and (2) 15mm x M4 bolts. The bolt hole passes through the entire piece so you could use longer bolts.
Magnets can be secured with epoxy or super glue.
Used three magnets to support weight of phone.
Mounted with (3) #6 ½" wood screws.
The author marked this model as their own original creation.