Every fingering that fits a hand
6543
hard
6888
hard
x113
moderate · barre · no 5
6588
hard · no 5
658x
easy · no 5
What is true of it
D♭maj7 is D♭, F, A♭ and C — 1, 3, 5 and 7 counted from D♭.
On an instrument that cannot reach all 4, the 5 goes first, in that order.
The easiest of the 5 fingerings below is 6543: 4 fingers, held at the 3rd fret.
None of them uses an open string, so this chord moves up the neck unchanged — the same shape 1 fret higher is the chord a semitone above.
1 of the 5 need a barre.
Where its notes are on the neck
The brass dots are D♭, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
D♭maj7/F
ac9b
D♭maj7/A♭
1014
D♭maj7/C
x014
An inversion is the same chord with a different note lowest. The name changes to a slash name because the bass is what a listener hears as the foundation.