One of my friends is planning to start a pizza shop. Earlier he used to make pizzas at home and deliver it. Now he has decided to make it as a business. The construction of his shop is almost done and is planning to start the shop by the end of next month. He would like to install security cameras in his shop before the inauguration of the shop. While installing a security camera, what is the most important thing that one must note? Is it necessary to install security cameras outside the shop? Please share your thoughts.