Storage to avoid flattened Tires

I have a 2001 740i that I must store for 5 months each year. I'm concerned about tire flattening. Does anyone know the best way to raise the car so there is little or no weight on the tires and rims? There are only 4 jack locations that I have found. Those need to become the blocking points leaving no place from which to jack up the car.

Storage to avoid flattened Tires