Does the effectiveness vary significantly depending on the number of Ulthera shots?

I've visited several clinics for Ultherapy consultations, but I'm confused because the recommended number of shots varies so much from place to place. Some say 300 shots are sufficient, while others recommend 600. Since there is a significant price difference, I'm wondering if getting more shots is always the better option. My face feels less elastic overall, and I'm particularly concerned about the area under my chin and the deep cheek fat. Is there a specific number of shots required for each area? I feel like even with the same 600 shots, the results might differ depending on how they are distributed across different areas. I'm curious if I should just check the number of shots during the consultation, or if the treatment design is also important to consider. Has anyone seen satisfactory results with fewer shots? Conversely, have there been people who received many shots but saw results that fell short of their expectations? I would like to make a decision after hearing the experiences of those who have actually undergone the procedure.