I wish I had a garage. Looking to place in my den until I make space in the storage unit.Anyplace inside (out of the sun and weather) is good. I made the mistake of leaving a stock set outside for a few years while a "made space" in the garage. Sun is one of the worse things for rubber. They may racks to hang on the wall if you don't have floor space.
I cut strips of wood to go between the rims to hold them off each other and make them stay stacked easier. Really easy to stack them in a corner under a bench in the garage.Much easier to store bare rims than with tires on. That’d be my recommendation. The rims will stack well in a corner but if they still have tires they take up much more space.
Keep tires off concrete, keep them away from sunlight, keep them away from electric panels/welders/etc.This will preserve the life of the tires ?