Hello,
A DOCX is not 'painted' as a PDF, it's more similar to HTML. So there's no option to know the exact position of a content until the DOCX is open using MS Word, LibreOffice, Google Docs or any other program, and the position and layout may vary depending on the program used.
The only way to accomplish what you need is using footers or sections. DOCXPath can query by section tags as well.
Regards.