Ah, okay, thanks.
It's actually "all grain" wort, ie: no work for me except adding the yeast and hop... not an extract. Perhaps I'm not using the correct terminology?
So, if I make a starter, and dump it in, it effectively mixes itself somewhat rather than sitting on the top, but this should not be a problem. I guess I was just worried there may be some hocus pocus alchemy that requires the yeast to sit on the top for best results. I won't worry!