I've been meaning to find a way to wall-mount my Harley Quinn bat ever since I painted it 4 years ago.... got a 3D printer earlier this month - I now finally have a wall mount!
The bat is held securely in place using tension (as the hooks face opposite directions), so you can mount it horizontally or diagonally (not sure about vertically... didnt try that).
The design is such that - if you wanted to remove your bat, its a simple twist and pull and its free.

I am new to 3D printing and designing, I used TinkerCAD to design the mounts, and printed them in transparent PLA (but because I used 75% infill.... its not transparent :facepalm: ).
I also added nail holes to the design - based on what I have on hand 1,4 x 25mm nails (each hook is attached at 3 points, so its pretty secure). The hooks are marked "T" and "B" for Top and Bottom (this was after I mixed the first set up...the bottom hook is slightly larger to accommodate the space needed for the end of the bat to lean against the wall).