Kidco Safeway Gate, Top of Stairs Gate, White

The banister at the top of my stairs and nearest stud on the opposite wall are off by about 6". Can it work properly at that much of an angle?

Will this fit in a 27-1/2" Opening? I do not see the width range for openings

Can this be hinged to lay flat against a wall when not in use, 180 degree swing

Has anyone used this in a doorway?