When should I consider a 360 degree camera?
If you are trying to cover a wide area and it will take multiple cameras in the same location looking in all directions, a 360 degree camera will probably be less expensive and provide more coverage than multiple cameras.
How many cameras do I need?
That depends on what you need to cover, usually a minimum of 4. Suggested camera placement includes all exterior walls of a building, inside of the main entrance door, other areas of interest such as safes, entrances to secure areas, public spaces.