Rhode Island Landlord Question - Mailbox

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In short, the question is: is a landlord in Rhode Island required to provide a post office box or a location to receive mail on the property?  If so, where could I find support for such a requirement in the Rhode Island code of laws/statutes/etc.?  If possible, the chapter, section, line number etc. would be great!

For more detail, my wife and I live on a property that is owned by the non-profit my wife works for. We live here for free and do not have a signed lease as us living here is contingent on my wife's employment with the non-profit, so we are governed by state law regarding our lease. We were told to have all of our mail sent to the non-profit's main address for our personal use (others do the same who do not live on the property). I have a single investment property in Missouri in which I have all of my mail for my LLC sent to our Rhode Island address. Today, the executive director told my wife that I would need to send my LLC mail to a post office box due to "gm and legal issues." As a result, I want to see if Rhode Island laws require a landlord to provide on-property mailing services.

For what its worth, the cost of a post office box would be worth the cost of free housing for us.  I am going to get a post office box, but I would like to know if the executive director is allowed to do this.