Hi René,
This plugin should suits your needs: WP ULike – Most Advanced WordPress Marketing Toolkit.
WP ULike plugin allows you to cast voting to any type of content you may have on your website. You can add a Like and Dislike Button on posts, comments, BuddyPress activity, bbPress topics and even WooCommerce products.
Please be aware that this plugin has not been integrated with our theme and might require some custom CSS to make it fit perfectly. However, it should work fine. 🙂
Hope this will help you.
Best,