Meridian D-ILA 1080MF2 Installation And Operation Manual page 39

Dimensions (Unit: mm)
Top
92.3
7
Front
89
298 2
15
267
Bottom
M6 (Depth: 10 mm)
Mounting screw should be more than 6
mm but less than 10 mm in length.
Side
36.2
181 20
67.5
Center of Lens
292
39