Magnum supply and install plain wire electric fences on top of perimeter walls or from ground level and up to three meters height.
Razor blade fence, ripper type, can also be installed, either separately or in combination with plain electrified wires. The electrified wire will activate an alarm on cutting or shorting to ground by an intruder.
A good perimeter security system can foil nearly 95% of attempted break-ins. It is the first line of protection against any intruder.