My Voyager keyboard and Ploopy Adept trackball are mounted to a telescoping section of T-slot that allows me to stand about 1.5 meters / 5 feet away from the monitors. This reduces eyestrain from working at a computer all day and, hopefully, helps slow the progression of myopia. I used ZSA’s Tripod Mount kit and standard ball-head tripod mounts to connect the keyboard and mouse to the T-slot. This makes for easy, secure tenting of the keyboard and mouse at the perfect angle.
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For implementers, the locking model adds a fair amount of non-trivial internal bookkeeping. Every operation must check lock state, readers must be tracked, and the interplay between locks, cancellation, and error states creates a matrix of edge cases that must all be handled correctly.