When I'm working out where to place hardware or otherwise proportion a woodworking project, if there isn't an obvious mechanical/physical aspect driving the placement, then I always turn to the Golden Ratio --- annoyingly, I don't get to hear the music or bell ring from

https://www.youtube.com/watch?v=8BqnN72OlqA

or the older black-and-white film which I was shown in school when I was young.