Apply auto layout on entire base frame or contents except fixed position navbars?

I would like to ask for best practice. Apply auto layout like A or B?
if A, how do I make sure no spacing in between Navbar and contents? in case accidental drag.
if B, I can control the spacing, just apply top padding, but I need to make navbar in absolute which may not be a good solution?

Thanks guys.

A is closer to how it would be implemented in code I think.

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