Every fingering that fits a hand
3545
moderate
324x
easy · no 5
3241
hard · no 5
3245
hard · no 5
xaab
moderate · barre · no 5
What is true of it
B♭7 is B♭, D, F and A♭ — 1, 3, 5 and b7 counted from B♭.
On an instrument that cannot reach all 4, the 5 goes first, in that order.
The easiest of the 5 fingerings below is 3545: 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 B♭, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
B♭7/D
7868
B♭7/F
aaab
B♭7/A♭
1211
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.