D-Link DCS-8515LH Manuel page 13

Section 2 - Installation
Mounting the Camera
of the power cord thread is also at the desired location. Use a pencil
to mark the holes.
Using a 6 mm drill bit, drill two 25 mm deep holes over the pencil
anchors to support the screws first.
Place the mount over the holes that are in the wall. Make sure to
align the mount holes with the holes in the wall. Use the supplied
screws to attach the mount to the surface of the wall.
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MSME Security Kit – Manual (Indoor Camera)