Holding Deposit or Security Deposit

[Nicholas Bolcon]

Hello BP, as always your input is appreciated.

To start I'm in RI in case anyone has familiarity with the local laws.  

I had applicants that passed my screening finally. They can't move in until June 1st which I think is reasonable for giving notice and not renewing their old lease. But of course that means I won't have it on the market for a month before they move in. Should I immediately have them sign a lease to start on June 1st and collect security deposit? Or should I get a holding Deposit equal to the security deposit (which is also one months rent)? 

I'm wondering which protects me best. RI law says security deposit can't be deducted from for future unpaid rent. I'm not sure what that means in the case of breach of lease and never moving in. 

Any advice is appreciated!