Dermal fillers to make forehead more flat than round, what is achievable & to what extent? (Photos)

I went to a certified plastic surgeon a couple days ago and told them that I wanted to make my forehead more flat than round and of derma filler would be the best option. And they said that they can do that but it's just something they haven't really done but it can be done. So they put Botox to relax the muscles up there first and I'm going in two weeks to finish it off with fillers. And I just wanted to verify that this is achievable and what extent? Can I do it like the pictures I put?