I don't think actual UVLS is ready.if it can be quad-packed, only a single 8-cell VLS is all that would be needed.
Public info about actual UVLS is limited to none.
Brahmos VLS is labeled as UVLS, but its bad, Brahmos UVLS is circular and in no way ut can quad packed.
I don't think it can even tri pack VL-SRSAM.