The Kendall Howard Rack Mounted line of shelves is another great way to store your non-rack mountable components.
This shelf is suitable for a monitor, modems, DSL routers, tape players, backup units, and virtually anything you can think of up to its weight capacity of 50 pounds. The 2U Vented shelf is made from 16 Gauge steel and individually formed by hand. Each corner also features radius ends for optimum safety and handling. It has a front and back flange to ensure your components cannot slide off.
The edges are flanges so your equipment cannot fall off