A belt tensioning motor mount comprises a support plate; a motor mount holding a motor, the motor mount slidably attached to the support plate; and a tension adjustor disposed on the support plate, the tension adjustor for adjusting the position of the motor mount along the support plate. In an embodiment, the motor mount includes an opening that accommodates a shaft of the motor, a driver pulley attached to the shaft. A belt is attached to the driver pulley on one side and a return pulley on an opposite side. The support plate is disposed adjacent a wall and above the belt which operates a plurality of sliding doors. In an embodiment, the tension adjustor includes a threaded bolt which, depending on which way turned, either causes the motor mount to slide in a first direction to increase belt tension or slide in a second direction to decrease belt tension.