I suggest a formation of nine people for reference only.
There is a line of people first, and then every other person walks forward to form a formation of the first four and the last five (if the singer dances, let her stand at the front of the middle to form a formation of 1, 3, 5).
Then the formation of 3, 3, 3 can make a circle or something at the climax.
You can make a compact triangle of 1, 3, 5 with your back to the back of the stage during the intermission of the song.
Then go back and start dancing the same dance as the first paragraph.
I wish you success ~ ~