/diy/ - Do It Yourself

I know these things are a meme on this board but I need a ton of somewhat water tight storage that I can drop on my property for cheap. I need it to be big, ugly, and weatherproof. I figure these are exactly what I need. Problem is I don't know what I need to do to prepare the ground. Can I just drop these things on the soil? Should I use leveled sand? Cinder blocks? A full-on concrete foundation? I want quick cheap weatherproof storage and I don't know a better way to go about doing it.