If the center front is very low and plunging like a v-shape, choose a plunge bra. They have minimal coverage at the center front and the cups are specially designed to provide ultimate support while showcasing your curves.
If the neck-line of your top is a scoop or square-neck, you may need a bra with half-cups or demi-cups. Demi bras come with and without padding. “Demi” just refers to the coverage of the cup itself.