Is there a way to fix the position of a placeholder?

This is what I want to accomplish in order:
Graphic header, navbar, placeholder(h1 tags), text content & images etc.
Also further down the page another placeholder say (h2 tags)

When I publish the page/site, there's no telling where the placeholder is positioned, generally way down the page.
I've tried using a text box and graphic above the main text content to no avail.

This is obviously for SEO purposes, but Please Please Please do not reply to this thread re SEO techniques.