Selecting a video surveillance system will depend, in part, on the nature of your home/office: size, layout, number of possible entry points, etc. Before purchasing a video surveillance system, figure out exactly why you need this technology and where you’d like to have the cameras mounted.But one thing’s for sure; no matter how many cameras you have, they must be able to provide a good view of prominent areas like rooftops, attics, doorways and other locations where intruders can gain entry or hide.