Take your position. Stand a fair distance away from the audience at a 45-degree angle, with your back to the crowd. You should be standing so that the foot closest to the crowd is mostly visible. The heel of the rear foot is visible, but the toe area of that foot is hidden by the closer foot.
The angle and positioning of your feet must be correct, or the audience will be able to clearly see that you aren't levitating. Practice in front of a mirror or with a friend who knows what you're up to before your performance.
If the audience asks you to move closer or turn around, tell them that this exact spot on the floor has the best vibes, or that you'll break your concentration if you move.