Freehand contains pendimethalin. Not really a good idea to apply on plugged lawns. The pendimethalin will cause the stolons to float on the soil rather than tack down and take root. The idea of using a preemergent to kill seeds before attempting establishment is something I have tried. EPTC(Eptam) was good for this due to its effect on nutsedge and grasses.
I have used Celsius and Dismiss on recently plugged areas without that effect. Simazine or Atrazine is also free from that effect, but it may be hard to use in Florida.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
Benjamin Franklin 1775
Sell not virtue to purchase wealth, nor Liberty to purchase power.
Benjamin Franklin Poor Richard's Almanac1738