A neutron star can only collapse when it gain enough mass to overcome the forces holding it together. Once it reaches that point it collapses into a single black hole, to make more than one black hole it would need to have much more mass! but once it reaches the tipping point for the formation of that first black hole it just goes, so it can’t ever get enough mass to make two.
I think even if it did make two black holes they would be so close together that they would merge very quickly.
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