I designed this side spool mount with AMS hub so i could have my AMS units hung on the wall to the left of my printer.
I use heat inserts on the rear to hold the stock spool holder (i use someone else'd print for the roller - thrutheframe) strong to the mount and then connect to the stock spool mounting points on the printer. The AMS is just screwed into the print with nothing extra needed.
I also forgot to mention this was designed for the arc enclosure, hence why there is a notch where it screws into the existing spool holder location, if needed i can tinker a flat version for those with P1S or the flat back plate.