When there is limited space behind either side of the door system (no stud bay or possibly only a glass curtainwall), all of our motors can be mounted as Inverted (upside down) or as K2 (horizontally mounted with an aerospace-rated precision automated gear box). Both Inverted and K2 can hold an incredibly tight tolerance with numerous extension shafts allowing motors to be placed immediately above the door or up in the rafters without worrying about shaft flexing.