Widget easily can be inserted as Code Block. You'll be able to configure collection to grab comments, number of latest comments to show and show/hide avatars, time and comment body. Also you may configure where widget need to be inserted after initialization just specifying container classname or id attribute.
Markup is simple:
<div class="recent-comments-widget" data-collection="blog" data-max-comments="5" data-show-avatar="true" data-show-time="true" data-show-body="true"> </div>
Purchasing this product you'll get javascript file which need to be injected on your page.