There is a lot more to the low or high grip than the motor position, high corner speeds on a high grip surface is also to do with the roll centre.
Having all of the components being as low to the axel centres is what gives the car it's high corner speed with out rolling over (grip roll).
The more mass above the axel centre creates chassis roll which loads the out side wheel which then increases the grip to the outside wheel untill either the cars rolls over or breaks away in a slide.
The Mass that is transferred to the rear in acceleration is where forward motor or battery position is critica, if all the mass is around the front of the car then less is transferred to the rear and the wheels spin up once the grip of the tyres becomes less than the mass that is being moved forwards.
So if a car has the right mass to give the optimal grip for forward traction and has the laterial weight below the axel centres will in theory work in any surface
I am not a designer so may have put a simplistic view on this so anyone one that is a designer please correct me.
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