How many shots of Ultherapy are needed for good results? If it is my first time, how many shots would be appropriate?

I am looking into getting Ulthera for the first time, but I am having trouble deciding because the number of shots recommended varies from clinic to clinic. Some places suggest around 300 shots, while others recommend 600. I am wondering if a higher number of shots necessarily leads to better results.

For those who have actually received Ultherapy, how many shots did you get? I am curious whether the jawline or sagging cheeks improved noticeably with just 300 shots, or if you needed around 600 shots to feel a definite lifting effect.

I would also like to know if the number of shots required varies depending on face size, the degree of sagging, and age. Since I don't have much fat on my face, I am particularly worried that receiving too many shots might make it look sunken. I am curious if the number of shots or the treatment areas were adjusted in such cases.