Update: uploaded .f3d file
Couldn't find a mounting bracket that I liked so I made this one.

Features:
LED strip holder that mounts on the back of the extruder bar at a 90 degree angle.
Designed for 12 mm LED strips
Uses 2 chamfered screws that came with my ender3 but weren't used for anything.
Screw holes are countersunk.
190 mm length
Will securely hold strip without use of tape.