Can i put 12×12 concrete blocks under my hot tub. We just bought a 10 person hot tub. We are putting it in our backyard and we don’t have concrete slab anywhere. So, can we lay down 12×12′s down?? They look like they are like 2-4" thick? I think the hot tub is like 8by8. Let me know. We don’t want to lay down concrete.