I use 3 straps / board screwed and re-inforced to the beams across the garage ceiling and they work a treat.
This shot is my 14 and 12'6 on the roof and my other 14' to the left with 11'6, 11' and 10' stacked above them out of harms way and still allowing the wife's car access to the single garage.
Whatever works !

BTW - that's a great setup DJ.