well according to US travel website, you dont need it. check what i quoted below:
Police Records
Available, only if applicant is physically present in the UAE.
Police certificates may be obtained by any person, regardless of nationality, by personally appearing at the Central Police Headquarters located in the emirate of residence or former residence. When appearing to request a police certificate, the applicant should provide recent photographs, a letter from the requesting authority, the date of residence in the emirate, and their passport.
Not available by mail. Post recommends that consular officers waive the general requirement to obtain police certificates unless the applicant lives in the UAE.