Congratulations! Your girls names are so beautiful!
One thing I’d personally recommend, especially with triplets, is giving each child a different initial, and ideally different ending sounds too. Since you’ll be calling their names together countless times over the years, it really helps avoid confusion if they’re all clearly distinct.
How about:
Odette, Adele, Colette, Mathilde, Elodie, Camille, Juliet, Valerie, Florence, Margot, Adelaide, Rosalie, Astrid, Leonie, Giselle, Bernadette, Lucille, Estelle, Brigitte, Amelie, Vivian, Beatrice
Hugo, Felix, Otto, Roland, Ansel, Vincent, Florian, Leander, Lucien, Conrad, Bastien, Edwin, Jules, Oscar, Leopold, Anton, Caspar, Marcel, Raphael, Olivier, Julian, Jasper, Gideon, Theodore, Ambrose, Wilhelm, Xavier, Damian, Nicolai, Magnus, Rupert, Laurence, Adrian
Hope this helps!