I do not know specifically about certified mail, but we had some medicine sent by USPS, signature required. The postal person was actually at the mail station, and flagged me down when I picked up our mail. When I asked her, she said that she would attempt a home delivery, and if we were not there, then a slip would be left to sign, so the package could be delivered.
A call to the Lady Lake post office should provide a more definitive answer.
Hope this halps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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