Our plastic case has not enough hole/slot to make a good air-flow and it is one of the main root causes of over-heating. We recommend you to use a heatsink when you put the board in the case. Check the test result.
Clip-Fit ODROID-C1 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.
3 screws are included in the package. You need only 2 screws, and 1 is for spare.