Cosigning for individuals or a group?

[Sheridan D'Agostino]

We are in the process of renting out one of our properties to four college students. They are all on the same sports team and have no "proof of income." We have met them and they have a good reference from their previous landlord. We are still diligently screening the tenants and they are agreeable to using their parents to cosign in one way or another.

Can I have one parent cosign for the group if they agree or does each individual renter need a cosigner? I hate to continue to pile on the fees for credit checks to do them on four sets of parents after charging the tenants for this. 

Thanks in advance!