Allied Telesis AT-SBx3106WMB - Manual (Page 17)

AT-SBx3106WMB Wall Mounting Brackets Installation Guide
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Figure 4. Brackets Aligned with Wallboard Studs
 The brackets should NOT be fasten intra-stud or with only two of
the bracket screws fastened to a wall stud. Refer to Figure 5.
Figure 5. Incorrect Installations on Wallboard
Caution
Do not install the chassis on metal studs. Metal studs may not be
strong enough to hold an object as heavy as the chassis.
Wood Studs