Amusing Hobby have molded a turret seating ring into their hull roof.
This is a sketch of the seating ring on a Tiger (H) with all of its bolt holes etc. marked. Although the relevant documentation has not been found, we expect the Tiger (P) ring to be identical except for the two smallest holes at the top left. A partial photo of a Tiger (P) hull roof does exist, and it matches this diagram.
Amusing Hobby have put their bolt holes in the wrong places. The inner and outer diameters and the thickness of their ring are also wrong. Amusing Hobby's ring is less accurate than Rye Field's ring, which has problems of its own.
The seating ring, however, is not visible unless the kit has an interior and the turret is lifted off to reveal it.