What is true of it
D♭m7♭5 is D♭, F♭, A♭♭ and C♭ — 1, b3, b5 and b7 counted from D♭.
A♭♭ is a double flat, and it has to be: every letter from D♭ upwards is used once, so the b5 cannot be written any other way.
These are also the notes of Em6/D♭. Which name is right depends on what is underneath and what came before — the notes alone do not decide.
The easiest of the 1 fingering below is 6777: 4 fingers, held at the 6th 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.
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♭m7♭5/F♭
9b9a
D♭m7♭5/A♭♭
0102
D♭m7♭5/C♭
4704
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.