Use as many as you can, a fence (chicken wire is the only sure way but on the down side it makes them stand out so you have to decide. Other methods 50lbs fishing line tied around the area at 2' 4' and 6', rotten eggs and peppers/hot sauce mixed in water and sprayed on plates every week or two (not in flower) piss, hair, dirty clothes ect.
There's even, motion sensor sprays (can't remember name) that work good but cost $50-70 a bottle.