American Power Conversion AP7862J - Manual (Page 10)

How to Install the Basic and Metered PDU
6 Basic and Metered Rack Power Distribution Unit
2. Insert mounting screws (provided with the bracket kit) in the top
and bottom positions in the channel where the brackets align with
the holes. Tighten the screws to secure the
PDU to the enclosure.
– Recessed orientation
– Raised orientation