Fascinators are definitely back n fashion. I think they look lovely, and with Black & Silver, a nice red flower would look great.
I think though, that one large one either in your hair, or on your dress shoulder would be very classy rather than two.
It depends if you'd knock it off whilst dancing though :-)
Take a look at this: - It's a hair clip, which might be easier to find:
https://www.pinterest.com/pin/40110252906357090/
Put the dress, buy the flower and see where it looks best, then either sew it onto the dress or glue it to a big hair-clip. Have fun!