As you already know PrestaShop 1.7.x has totally new template called "classic" theme. New version of PrestaShop contains many changes, these changes affects each available visible part of the shop, also from technical point of view. So - new version of PrestaShop 1.7.x has many new hooks, some of old hooks are not available anymore. Because of this it is worth to explain what hooks are available and where exactly. Especially if you want to use some kind of custom contents modules. Below you can find a list of available hooks with short explanation. I added also screenshot where i show where the hooks appear.