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At an inliner configuration the crown wheel is placed off-center (radius of the pinion) on the rear axle.
In this way, the moments left and right are not in balance.
An inliner configuration results also in less weight and grip on the rear axle compared to a side- or aglewinder.

Positioning the inliner motor off-center in the floorpan, would result in a car that reacts different on left hand- and right hand bends. 
(I guess that is the reason why the inliner motor is always in the center of the floorpan, with a disadvantage during braking).

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