Fla. Stat. § 48.183 § 48.183

(1) In an action for possession of any residential premises, including those under chapters 83, 723, and 513, or nonresidential premises, if the tenant cannot be found in the county or there is no person 15 years of age or older residing at the tenant’s usual place of abode in the county after at least two attempts to obtain service as provided above in this subsection, summons may be served by attaching a copy to a conspicuous place on the property described in the complaint or summons. The minimum time delay between the two attempts to obtain service shall be 6 hours. Nothing herein shall be construed as prohibiting service of process on a tenant as is otherwise provided on defendants in civil cases. (2) If a landlord causes or anticipates causing a defendant to be served with a summons and complaint solely by attaching them to some conspicuous place on the property described in the complaint or summons, the landlord shall provide the clerk of the court with an additional copy of the complaint and a prestamped envelope addressed to the defendant at the premises involved in the proceeding. The clerk of the court shall immediately mail the copy of the summons and complaint by first-class mail, note the fact of mailing in the docket, and file a certificate in the court file of the fact and date of mailing. Service shall be effective on the date of posting or mailing, whichever occurs later, and at least 5 days must elapse from the date of service before a judgment for final removal of the defendant may be entered.