About this detail of the Tiger
In a Tiger E, the rear of the engine had an integral supporting frame. This frame was much the same for a HL 210 and HL 230 engine. The only significant difference was the position of the gears for the starter device.
The frame stands on two posts welded to the floor. It is fixed from below by bolts, accessible from outside the tank [2] .
The HL 230 engine was also fitted to the Pz Kw V 'Panther' and Pz Kw VI "Tiger B" tanks, but in those tanks it had different supports at the front and rear. Here is the rear engine support [1] for those tanks. It places the engine 25mm to the right of the vehicle's center line.
[1] Workshop drawing 021 B 425 B1 : HL 230 external dimensions
[2] Survey of Tiger 250122, at Bovington museum, by David Byrden