somehow they come with 3 screws. I don't know why, I used 2. The holder has 2 normal holes on one axis and 2 slotted holes on the other axis. It's not very useful to have slots in this configuration. The hollow wall anchors that come with it aren't the best. What got me thinking is a hole on the back of the holder that matches the reset button on the back of the M5. How do you access this hole once the holder is in place? Maybe just for alignment? Otherwise great as a wall/ceiling mount.
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