My husband didn't think either of these things were an issue, but I hated dragging the coffee maker out across the countertop ...
Easy, Secure Sliding: The sliding under desk keyboard tray allows you to pull the tray out when needed and slide it back under the desk to save space. The tray sits 11.3″ back from the desktop ...
There are several types of tray (also called magazine or holders) that are used by slide projectors. The common one is the Universal (U) - a straight magazine with a capacity of 36 or 50.