... you'd also put an inlay marker between the 12th and the 13th fret.
File this post in the "That guy doesn't like 1st-fret markers" file. Nut, then marker. Octave fret (12th) then marker? Logically?
Markers are needed at neither the 1st nor the 13th fret. Ime. Is the nut invisible to you? Myself, I can see it there. YMMV.
edited to add: The photo is just from Google Images. The clear graphics are nice and sarcastic though, eh?