Good three point shooters in their Top 5 Guys:
MIA - 1
ORL - 4
ATL - 2
LAL - 1
The zone should work well against three of our four main competitors.
I don't think Zone will work well against Miami.
Not really a reliable statistic for that three pt shooters info you put up. LA has two in their starting 5 (Kobe and Fish) and should have 3 with Artest (though he forgot to shoot all last year until game 7... sigh). Miami also will have Miller and LeBron is pretty good at about 33%. They also have House and Jones that are 3 pt shooters and Z can even step out there. They have a number of guys who are good midrange shooters as well, if they don't step quite that far out reliably.
Anyways, the zone is not the lane clogger in the NBA that it is in the college game because of, like other have pointed out, the 3 second defensive call. Miami may not have the most 3 pt shooting but LeBron, Wade, and Bosh are all good midrange shooters and they are all very good and unselfish passers. They draw so much attention and are so good at finding open men and cutting when they are open that a zone would be absolutely torn apart by them, as Fafnir says.
Interior passing and ability to cut and penetrate are good tools to use against zones without the 3 second call, with the 3 second call its a joke. The zone will not be useful against Miami.