... three different mounting locations: ceiling mount, side wall, and end wall. Each of these (with one exception) captures the whole hallway, but there are nuances in field of view to be considered.
It might not be ideal for your hallway example, but is there any value in out-facing corner (270 angle side) mounting? Is pendant really the only/best way to do this?
With the angle being so wide (>170) on some of these mini/microdomes, a corner can work well. It seems a waste to take up a large part of the FOV with a closeup of the wall that they are mounted on, yes/no?
However, some end users will not accept the aesthetics of domes mounted to the surface of their ceiling...
The Honolulu Post Office for instance will accept no surface mounted domes bigger than Tomahawk class ICBM's. Speaking of, have you made it back there for a closer look at the warheads?