Is it possible to get Botox treatment for this?

Is it possible to get Botox injections in the trapezius muscle area?

Since I spend a lot of time working in front of a computer, my neck and shoulders are always stiff and sore. When I looked in the mirror, the line from my neck to my shoulders jutted out too high, making my neck look really short and my overall build look bigger. It was a huge source of stress for me... On top of that, as the weather gets warmer, I find myself wearing low-cut or lightweight clothes more often. I was stressed because the nape of my neck didn't fall nicely, so I started thinking about getting Botox to help.

I want to soften my particularly protruding shoulder muscles to make my neckline long and slim. I am wondering if you can properly administer the right amount tailored to my shoulder condition and body proportions. I am also worried that my movements might become sluggish after getting Botox.