Regarding the side effects of Ultherapy on the cheekbones, is it possible to improve elasticity without causing hollowing?

As I get older, I am concerned that the skin below my cheekbones is sagging, making my facial contours look uneven. I am looking into Ultherapy to restore elasticity, but I am hesitant because I have heard that receiving treatment on the cheekbone area incorrectly can cause the cheeks to lose volume and look sunken. I would like to know if you were able to safely see firming effects without the side effect of sunken cheeks when receiving treatment focused on the cheekbones.