Should I Let my PT Fence Dry Before Installing
On the contrary, install when while wet to prevent splitting when you install fasteners, and allows fasteners to set easier. We actually soak pickets in a trashcan full of water before installation.

As far as the footing requirement, I'd tell Florida to suck it. Set your posts to adequate depth (general rule is depth = 1/3 length of height of post), leave the concrete at the home center. Hundreds of thousands of miles of unconcreted 50+ year old fencing across the US and other parts of the world are not wrong.