Before you install a hedge consult with your neighbor(s). You may be able to agree on sharing the cost and upkeep, otherwise at a minimum be clear about your intention to take full responsibility for limiting its size (especially important for fast growing items such as ficus hedge). Before digging any holes, be mindful of the location of underground service lines: water, sewer, electric, telephone and cable tv. Enquire of local ordinances regulating the height of a hedge, particularly for corner lots. Clusia and Podocarpus are the best Hedges for south florida climate
15-Gallon Clusia-Hedge Plants for Sale 