Network Shelf or Rack?  

In many ad-hoc type network environments that are not managed by a specific MSP or onsite IT personnel we have encountered all styles of hardware mounting.  Typically a wall cabinet is the preferred choice.  But when your organization takes a re-active approach typically we find that the equipment is usually tacked up against a wall with screws or shelving.  Typically if you take this approach it is required by code that you use a fire rated backboard or plywood that is coated in a fire retardant spray. 

A somewhat organized wall mounted configuration.  Notice no backboard though, and no room for new devices. 

Two free standing floor cabinets.  The one on the lefts cables were managed a bit more properly.