Around here, the switch/button must be in the center of the red triangle, 80" above finish grade. If the location is not on the drawings, then somewhere near the poco xfmr is best.
So far, I've never had to move one per the fire marshall.
If the building has a switchgear or meter/main outside, the red triangle may be placed on the door that houses the main. If a gen is present, there must be a switch in the same cubicle to kill it.
The idea is if the fire dept. needs to have all power off in a building, they can do so from one location.