The situation that you describe here would fit perfectly under the Florida law that you mention.
Basically, what the Florida law does is to codify when force is justified and when a person must refrain from using force. The law says that any person who is legally in a dwelling may assume that any person who enters the dwelling illegally is going to cause them bodily harm or death. The law further states that the person in the home legally has not duty to retreat -- they do not have to try to run away.
Both of these would apply to the situation you mention. The first part of the law tells us that the home owner has, by definition, reason to fear being harmed or killed. The second part tells us that he does not have to try to run away from the men. If he has a reason to fear for his life, and if he does not have to try to escape, he is clearly allowed to shoot the intruders.
Therefore, the Florida law clearly applies in this situation.