Safe Zones will only work if the police constantly harass the homeless when they camp in the parks, beaches, and streets.  Let it be clear to them that there are alternatives (Safe Zones being one option) and defecating, littering and destroying our parks and beaches and their infrastructure is no longer acceptable and will result in prosecution to the fullest extent of the law.  Tap into a park's light pole to run the aircon in your tent and you'll be arrested for theft of services.