Statistically, most intrusions occur through doors. For this reason we recommend a sensor on every exterior door of your location. Overhead doors on residential location are not typically recommended, but can be armed if desired. Standard door sensors included in the quote are surface mounted on the interior side of the door. For aesthetics on custom doors, we have recessed sensors that can be inserted into the door and are not visible when the door is closed. If you need custom door sensors, please call us to discuss the type of doors you have and the pricing for sensors and installation.