Windstorm insurance coverage for a group of no fewer than three communities created and operating under chapter 718, chapter 719, this chapter, or chapter 721 may be obtained and maintained for the communities if the insurance coverage is sufficient to cover an amount equal to the probable maximum loss for the communities for a 250-year windstorm event. Such probable maximum loss must be determined through the use of a competent model that has been accepted by the Florida Commission on Hurricane Loss Projection Methodology. Such insurance coverage is deemed adequate windstorm coverage for purposes of this chapter.