A door opener assembly may include an opener housing including a well and at least one hook member. A pin-reception channel may be formed through a portion of the well. The hook member(s) is configured to hook onto a portion of a frame. The door opener assembly may also include a frame-securing member having a pin retained within the pin-reception channel. The frame-securing member is configured to be urged into the well to lock the opener housing to the portion of the frame.