My coop is raised to about that heighth and my chickens hang out under the coop in the heat of the day. My run has a 2X4 base running around the perimeter, with non-climbable wire fencing attached. This arrangement was sufficient during the day, as there are no domestic dogs to worry about here. Most preditors are active during the night or near dusk or sunup hours (skunks, coons, coyotes). That is when your chickens are most vulnerable to attack, except for chicken hawks who will attack during the day, if they are out free-ranging. After a racoon got inside my coop at night, I installed 2 electric wires around the perimeter to help protect them at night. One wire is about 4" off the ground and the second wire is about 8" off the ground. My coop door is secured at night with a steel rod run through two pipe hangers attached to the coop, on both sides of the ramp door. I have not had any more trouble with night preditors. Once in a while a hawk will look the situation over and then fly away. A big crow landed outside the run and when it approached the run looking for feed, the wire zapped it and it flew off and hasn't been back. Good luck!