If you want to keep
your floor warmish. I use horse stall mats 1/2 inch rubber 5x7 feet on my floor which I get at TSC for $45 on sale @David Stroud IM Roadster D they are on sale today
work well for me they break the cold humidity under the car
i bought a car capsule and have never used it as I find myself always doing something on the car in the winter storage season.