Just as if you would place a clock in all areas of your home, you should place a smoke detector just about everywhere you can think of in the rooms of your home. Since they have such an exceptional vantage point, they are ideal for being the home to one of the infamous hidden security cameras. Due to the amount of space required to fit the camera inside of these units, they are not able to function as a smoke detector as well. You have to remember that their main purpose is to serve as a security camera and not as a smoke detector.