yeah, as long as you're a florida resident fishing from land or a structure fixed to land, you can fish with as many poles as you'd like...eeerrr... as you can HANDLE.
and if not a florida resident (i'm assuming that you are), but if you're not, all you will need is a non-resident license to fish from the surf, or any pier or bridge that you DO NOT pay admission to... places like pensacola beach pier, your license is covered under your cost for admission.
interesting question. One I never thought to ask because I've always used mutliple poles and have seen multiple poles being used. But I'm not sure I've ever seen in the law that states where you can.
If you are using multiple poles and are with someone that doesn't have a license, take care in making sure that person doesn't touch or even looks like they are fishing with you though. I've always gotten my wife a hunting and fishing license for that reason, the cost isn't worth trying to explain how she's not fishing.Out of state license can be a little more though.