I also ran into the … talking head frame issue. Mine was located over my 1-12 type toolbars that I have located at the bottom of my screen. Immersion has its own talking head box too, but i wanted to move the Blizzard one that would appear on its own.
So far right clicking the General on the left chat tab (im using Elvui) and edit mode and when saving it make it unique settings per character. Its working so far for me and i know i have to adjust it per character, but once done… hopefully things are good.
As for immersion… the other advice on that… also helps with moving its own talking head. I love both addons even if very techy at times.