Insert ads like products

Hello,

if you theme calls WP action hooks there you can use standard positions for automatic insertion:
https://adinserter.pro/faq/how-ad-inserter-works#automatic-insertion

Or custom positions:
https://adinserter.pro/documentation/additional-block-settings#custom-hooks

In any case you can insert code at any HTML element:
https://adinserter.pro/documentation/insertion-before-inside-after-html-element

Of course, you need to make sure you will not break HTML code or page layout.