Phongkd Another suggestion is if you use the Chrome browser (or any browser that lets you download extensions from the Chrome Web Store), you can use the Ezoic Chrome extension to manually input the placeholders on the page itself so you can see exactly where it goes. Or if you rather like to do it through HTML, you can put at least one placeholder with the extension and see how it looks like so you can somewhat mimic what it looks like from there.
For more information on getting the Chrome extension and how to use it, you can use this support article.