Stick on bras?

I've just ordered my first stick on bra as I have a dress that I love but none of my bras go with it.

I have very small boobs, size A, so im hoping this bra can give shape back without bra straps showing.

I went for one from Boux Avenue but I'm interested in anyones experiences of them in general. Either whether they worked or not or any tips you have.

Like I said I have very small boobs so luckily dont need support just need it to stay in place and give me shape ☺️ praying it works!