Every fingering that fits a hand
x644
easy
b89b
hard
b899
hard
b89x
easy
What is true of it
G♭sus2 is G♭, A♭ and D♭ — 1, 2 and 5 counted from G♭.
These are also the notes of D♭sus4/G♭ and C♯sus4/G♭. Which name is right depends on what is underneath and what came before — the notes alone do not decide.
The easiest of the 4 fingerings below is x644: 3 fingers, held at the 4th 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 string stays silent.
Where its notes are on the neck
The brass dots are G♭, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
G♭sus2/A♭
112x
G♭sus2/D♭
6644
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.