The door we use to exit and enter the house 99% of the time is a set of French doors at the rear of the house. They aren't as sturdy as the regular (single) front door. Years of working on them hasn't helped much. A contractor buddy of my husband's said they never will as solid as a regular door. This part of the country with our particular soil, extreme droughts and extreme flooding is a problem with foundation heaving and sinking. I'm guessing that precise stability with the dead bolt is crucial for a smart lock to work. Or is there wiggle room? If you have one could you let us know what kind of door it's on and what, if any, problems you've had with it please. Also, what brand do you have?
Thanks