Intuitively, I feel like tempo markings should go above 1st (or 2nd, 3rd etc.) bracket lines, but I've seen examples where these go below (inside?) the bracket. Does anybody have a definitive answer as to a conventional way to do this?
From Elaine Gould's Behind Bars (pg.182): "Place all tempo indications above the uppermost stave, and above all other performance instructions. They should be well clear of slurs, octave signs and articulation."
As far as alignment goes, she goes on to say that each tempo indication should align with the left-most part of the first notational element to which the tempo applies.