ORIGINAL: heavyaslead
The Pershing recoil does elevate below the turret opening but not quite past the ring gear.
There is little opportunity to mount the slip ring in the turret or from the upper hull as the profile would not suite proper wire rotation IMO.
The hull seemd the best mounting for the slip ring in the Tamiya Pershing.
Shown in the pic is the maximum elevation of the recoil unit: