I simply asked my mom to allow me 5 minutes and a red pen to put a few notes on the cabinet manufacturer's drawings for them to edit for her full bathroom remodel. Thankfully she allowed me to do so for "Her son's Peace of Mind". My "redlines" to their drawings were to put blocking behind the walls in all the locations that a "future" grab bar might be useful and installed at a later date. That way, when my "I told you so" moment came in the years ahead, I wouldn't need to say that to my parents.