Well, Jester911 says it best with this;
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Would you jack up your car by the floor pans?
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And as one who has had both types of cages, crewed for pro teams have friends who build race cars for a living, DON'T GET A FLOOR MOUNT!!!!
As to whether or not it adds a lot of stiffness, well, I have found that it does, the car, with nothing else change was much stiffer.