Expand that. Why not use the natural terrain or a man-made large excavation, such as a quarry? Basically a big hole with a loud and noisy speaker to attract the walkers in a pit? A honey pot? Draw them in for miles. Immolate, rinse and repeat.
Why not go the REAL governor’s personal mansion in the country? It has high gates, likely solar, likely plantable lands, likely a well or two, every luxury known, and just stab the walkers thru the fence as they advance?
Then build walker traps, 100x100 D-9 dug holes and bait them with chickens?