Encore electronic ENMGS-16+2 - Manual (Page 18)

Leave at least 10cm of space at the front and rear of the hub for
ventilation.
Install the Switch on a sturdy, level surface that can support its weight,
or in an EIA standard-size equipment rack. For information on rack
installation, see the next section, Rack Mounting.
When installing the Switch on a level surface, attach the rubber feet to
the bottom of each device. The rubber feet cushion the hub and
protect the hub case from scratching.
Figure 1. Attach the adhesive rubber pads to the bottom
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