Florence and
Beatrice are great twin names, they're matchy without being themey.
Matilda and
Miranda don't match as well. '
Florence Matilda' sounds more matronly and '
Beatrice Miranda' sounds younger (or just more timeless? I'd assume this is a deliberate Shakespeare combo while
Florence Matilda doesn't stand out to me as anything in particular).
I'd almost want to replace
Matilda with
Meredith. They both sound old-fashioned to me but
Florence Meredith seems nicer for some reason.