p.s. I would investigate thoroughly the whole storage facility idea with whichever one you might choose to use.
Some companies will not let you put someone else's name on a storage unit if they are not present to sign the contract. So, your ex may or may not be able to get into the facility by himself.
Also, if you have to sign out a storage unit, it's in your name, you pay for one month assuming he will show up to claim his stuff--he may not. In that case, you would be defaulting on a contract in your name, which could negatively impact your credit rating.
Just a couple of things to investigate.
Whatever you work out, I know you will be happy to just have this all over with!