Great question — answering as the UphillTech team:
There are several ways they're commonly installed, any of which can be considered "normal": To a standard or old-work electrical box To a low-voltage bracket or frame To hollow-wall anchors in the drywall or concrete
Full answer by isherwood: https://diy.stackexchange.com/a/155231 (CC BY-SA 4.0).
Need it done for your business? UphillTech.
