I have a question regarding the larynx.

I know that when doing normal singing it's important to keep the larynx in a basically neutral position and let the pitch change independently, but is it the same way with things like gutterals, growls, and screams?

The reason I ask is because when doing extreme vocals I tend to push the larynx down to lower the pitch, and push it higher in the throat to raise pitch and wondered if this was the correct thing to do.