Since South Florida’s last direct hit in 2005, when Hurricane Wilma swept across the state, the number of high-rise buildings has multiplied, altering the skylines of Fort Lauderdale, Miami, Hallandale Beach, Miami Beach and other cities. Constructed to the toughest building code of any state exposed to hurricanes, they are unlikely to suffer significant structural damage from even the strongest storms, experts say. But that doesn’t mean they are a good place to stay in a hurricane.