The bracket supports a PT-1810 PTOUCH Label Maker and is mounted using 2 deck screws into the studs behind the sheetrock of my workbench. I use it on a 45 degree sloped wall/ceiling.
The screws I use are are Deckmate #8 1-5/8inch (Deckmate model 1005 193 765)
Print so the wall surface is perpendicular to the print-bed. No supports needed on the Bambulab P1S. I use overhang speed of 10mm/s and the screw holes work without supports.
I print with Polymaker PETG.