Apop', googling photos of the two guns you list, neither look quite like what I saw, similar though. The barrels of the AD guns I saw looked like the 40/60 barrels, only they were set low in a small turret in pairs like the 40mm/56 Mk.V. The closest I can describe how the guns were mounted on the trailer is how you see this below, only with a turret
The turrets didn't look big enough for human loaders to be inside them but I might be wrong there. IIRC there was more than one on display and they were controlled by a remote radar unit set on it's own trailer.
In the display area they were close together, but my buddy says they would have been placed more widely apart in the field.