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Since Flora ends in a vowel, I think a mn that begins with a consonant would flow the best. From your list, I like these

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Flora Beatrix
Flora Benjamine
Flora Cecily
Flora Celestine
Flora Clementine
Flora Constance
Flora Dagny
Flora Josephine
Flora Juliet
Flora Lucrece
Flora Maisie
Flora Manon
Flora Marjolaine
Flora Melisande
Flora Ninon
Flora Nimue
Flora Penelope
Flora Pomeline
Flora Sibyl
Flora Signy
Flora Tamsin