We are very fortunate. Stored inside a building on a chicken farm. Nothing gets on the property before going past the managers house & dogs first.
Further we are at the back of the building. First one in in the fall, last one out in the spring with farm owners class A in front of us along with a few boats & equipment in there. Somebody lays an eyeball on it every day.
Did the outdoor storage for a couple of years. Didn't like that at all. Once at a storage facility. Once in fenced are of a CG.