Is 300 shots of Density enough for a full face treatment?

I have been looking into Density lately due to skin elasticity issues, but it is difficult to choose because the number of shots quoted varies from clinic to clinic. Looking at promotional prices, 300 shots seems to be the most common, so I am thinking of getting that for now, but I am wondering if that is sufficient to treat my entire face.

The areas I want firmness in are overall facial elasticity, but specifically the sagging under the cheeks, jawline, and around the mouth. However, rather than focusing on specific areas, I would like the firmness to improve naturally throughout my entire face.

However, even with 300 shots, I suspect the actual areas treated will vary depending on face size and skin condition. I am curious whether receiving 300 shots for the entire face ensures sufficient energy reaches the jawline and cheeks, or if it would be better to increase the number of shots to focus on the specific areas where I want to see results.