Possessives and Attributives
Q. For our work editing projects, we have had a long-standing debate over the wording “renters insurance” (as a concept). There seems to be no industry standard with regard to using an apostrophe. Which should it be? Renters’ insurance, renter’s insurance, renters insurance.
A. All those forms are fine, but Chicago prefers the plural possessive. Please see CMOS 7.25 (Possessive versus attributive forms).