Just an idea, from someone who is constantly looking for more storage of empty ML speaker boxes, but that I have not wanted to break them down.
If you use zip ties, you run them through the holes in your garage door rails and make a loop that you can then use rope or twine to suspend your speaker boxes from the ceiling in your garage. Works especially well when you have two garage doors that are side by side.
Keeps them up out of the way and keeps varmints from eating wholes in them.
Also works from bare rafters and through ceiling tile into rafters with the use of an eye screws in case you want to use the ceiling corner in the garage.