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https://ru.wordpress.org/plugins/related-posts-thumbnails/
You can specify number of related posts to display, start date, categories to show on and to include, top text, style settings, default image URL. You can select type of relation — categories, tags, categories and tags, random or custom taxonomies. You can specify where to display related posts — choose page type (main or single), post type and select categories. You can turn off automatic appending to the end of post and use <?php get_related_posts_thumbnails(); ?> php tag in the Loop of your theme. Related Posts thumbnails sidebar widget is also available. You can use [related-posts-thumbnails] shortcode in the post body.