The following switches come with small ears that can rotate 90 degrees for wall mounting:WS-12-250A
WS-12-250B
WS-24-400A
WS-24-400B
All other switches come with (2) through holes from top to bottom of the switch is 2 corners that allow you to screw the switch directly to a flat wall with the screw going through the chassis.
DO NOT OVER TIGHTEN AND BEN CHASSIS AND BE CAREFUL NOT TO RUN A SCREW INTO THE SWITCH BOARD INSIDE.READ THIS POST: viewtopic.php?f=6&t=1036&p=7782&hilit=wall+mount#p7782If you do not like using the through holes you can buy the ears used on the WS-24-400A
HERE then you can rotate them 90 degree and wall mount.
HOWEVER THE WS-8-250-XX and WS-10-250-AC will not accept rack mount ears so you need to use through holes or DIN rail mounting.
Most switches have DIN rail mounting:
http://www.netonix.com/accessories.html