The best way to offer the best possible security is by combining human security guards with a well deployed security camera system. When you have an establish security system in place, you can better organize your security team so that you can quickly respond to any threat that may present itself. An example of a system that may be of use to you are these 16 Camera DVR System Kits, which you can find at SpyTown.com.
A 16 Camera DVR System Kits gives you an extraordinary amount of coverage when it comes to monitoring a large structure or complex. 16 different cameras means 16 different angles so that you can maximize the amount of area your team can see at any one time. All you need is to have one security guard stationed at the central control room, where they can constantly be looking at all of the monitors that are supply the footage of the 16 cameras. As soon as a potential situation presents itself, that guard in the control room can direct other members of the security detail to the correct location to quickly resolve the threat.