ATEN KN Series 32-Port KVM over IP Switch with Dual Power/LAN (1-Local + 4-Remote Access) - Manual (Page 41)

Chapter 2. Hardware Setup
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KN4164V / KN8164V Rack Mounting
The KN4164V / KN8164V can be mounted in a 19" (2U) rack. The mounting
brackets can screw into either the front or the back of the unit so that it can
attach to the front or the back of the rack.
Rack Mounting - Front
To mount the unit at the front of the rack, do the following:
1. Remove the six screws at the front of the unit.
2. Use the M3 x 8 Phillips head hex screws supplied with the rack mount kit
to screw the rack mounting brackets into the front of the unit.
Phillips head
hex M3 x 6