While I can't say for sure any allow more than two, keep in mind you are not dealing with a rental agency in the states. Even in the states, most companies will charge for additional drivers. Some waive the charge if you are a member of their loyalty program but some even charge for a spouse.
You can go to the Sponsors link and contact the various agencies on the island. I think 2 drivers is about all I have ever seen on a contract though.
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