Asus RS161-E4/PA2 - Manual (Page 20)

Chapter 2: Hardware setup 2-4
R
KFN4-DRE
2.2 Motherboard information
Place eleven (11) screws into the holes indicated by circles to secure the
motherboard to the chassis.
Place this side towards
the rear of the chassis
Refer to "Chapter 4 Motherboard Information" for detailed Information.
Make sure to unplug the power cord before installing or removing the
motherboard. Failure to do so can cause you physical injury and damage
motherboard components.