Best practices: Should generateStaticParams be written on layout.tsx or page.tsx ?

[nicolas-zozol]

Summary

If I understand correctly, generateStaticParams and generateMetadata can be written at both files, and page.tsx takes precedence on layout.tsx.
layout.tsx is facultative. For what I tested, metadata will be generated by the closest parent found. So page.tsx, and if not found in page.tsx, the closest layout.tsx found in the tree.

But I don't feel it makes that sense for generateStaticParams to generate path also for children. It may work but is probably a bad idea.

So what is the best practice before I ship to users a framework I will not control later ?