ExacqVision LC-series NVR rack mount
thingiverse
Four versions, variations that are hollowed out for SLA printing or solid for FDM, and using stock screws for the front panel or providing your own longer ones (15'ish mm in whatever size) since you forgot to measure. The machine screw is likely a #6. Push it firmly into place so the lip sits tightly against the front case then tighten the case screws. The lip helps by transferring some of the leverage from the length of the unit to the bracket, making it easier to secure the tiny screws.
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