I'm working on a prototype that has a few fine pitch (0.5mm) components. I'm thinking about adding local fiducial marks for these components as an afterthought. My idea was to place them close to the components where there is space for them. However, I have read here that local fiducials should be part of the component landmark. Do local fiducials really have to be placed directly at the component to be useful for the pick and place machine? Are they usually part of the footprint?
An example for my naive approach looks like this: