Do you have way too much slime?  Perhaps from Peachybbies?  Have I got a solution for you:  the Slime Wall!  The uploaded 3mf has a plate with 12 mounts on one A1 plate as well as a plate with a single mount for testing.  This is the very first 3d model I ever created and printed myself when I started my 3d printing and modeling journey and I still use it to this day… well, my daughter does anyway.

Installation

Step 1: Draw a grid on the wall in pencil 

Step 2: Drill holes and insert sheetrock/drywall anchors

Step 3: Print enough mounts

Step 4: Screw them all to the wall (not too tight, just tight enough to stop the mount from spinning around when there's slime in it)

Step 4: Enjoy!