Hi Hugh! I think you're fine as long as you place the code anywhere between your BODY tags. Most people do this either toward the top of the page or at the bottom near the closing BODY tag - at least in my experience!
The way I've done this in the past is to set up a separate conversion template to make sure the code is embedded properly in the HTML, but you can probably use the drag-n-drop HTML feature on the landing page to place it somewhere, as well.