An outside area fence shall be a minimum 12 foot high security fence. Fencing shall be installed within fence posts. The footing of the fence shall be sufficiently secured to preclude tunneling and hiding of contraband. When double security fences are utilized, they shall be separated by not less than ten feet. Guard towers and/or comparable electronic detection systems shall be utilized and towers shall be provided outside inmate occupied areas. Alternative design concepts are encouraged and comparable materials and methods approved by the commission may be utilized.