The Black ODORID-C4 case has openings for all outputs including the GPIO port making it a great fit projects that are connected to external hardware.
The cover of GPIO part can be easily removed by simple cutting of a few ribs.
Clip-Fit ODROID-C4 mount with optional screw locking.
If you want more secure lock, you can use 2 screws. There are 2 screw holes on the bottom side.