Door operator systems include the use of an adaptor. The adaptor may be utilized to operatively couple separate door operator assemblies together in a double door operator system. The adaptor includes control components (e.g., switches, buttons, toggles, or levers) that are used to turn the door operator system on and off. While the adaptor may be used to operatively couple two separate door operator assemblies together to form a double door operator system, the adaptor may also be used within a single door operator system. Furthermore, with respect to double door operator systems, the system may also utilize a back plate assembly formed from two or more separate back plates (e.g., two or more back plate portions).