You don't need an alarm in Poinciana unless you are not at home most of the time and it is obvious. Common sense works better than alarms in many cases. For example, always park cars inside garages, don't let empty garbage cans sit out all day, don't let newspapers reproduce on driveway, and -- if you don't own a dog -- make it look like one lives with you anyway.
We've lived in Solivita 13 plus years and do not have an alarm system. We love all the activities available to everyone. We may just be fortunate, but we have never had a problem in all those years and we have many friends who have never mentioned any security problem.