Often it is said that the larynx has to be low; and in my experience this is often a misunderstood concept. In the high notes it has to be high enough to be correct for their production. There is a range of movement that is correct for voices and notes production and it is in this range that we have to manage its movement. Tha larynx has to be in that range for every note, just lowering in the moment of voice production. To have in all the extension an innatural low larynx will create more problems then it solves, and will need an exaggerate need of pressure that can be accepted and desired only for the last notes of each tessitura or in certain cases of belting. The larynx will come up and down in a controlled way along the tessitura, just it will lower a bit in the correct attack.