Hi @Lucian_Dinu, thank you very much for pointing this out. Good to know about it.
So I would go with inserting the HTML element before the closing body tag (</body>), in other word, right after the footer but not including in the footer (as it is per page): have you implemented it this way?
But I would keep the idea of having the possibility to add a custom header code par page.
I see that you have requested a feature that may resolve this: Dedicated <head> script area. I up voted and added the request of defining head script per page.