I am looking for smart security systems variants. I wish it would follow several requirements. For example, flood detection, fire detection, motion sensors, sirens, and remote control. I see a lot of variants on the Internet, like Ajax security systems. They have so many opportunities. I am not sure I need all of their products. Do you know if I can choose only a few of them or is it only possible to install the whole system? Does it worth t? Maybe you know any other reliable providers?