Sorry, I did not try out any of them with our product, therefore I am not in a position to recommend any of them, in case they cause any conflict with our product.
But speaking from my personal point of view, you can try out this plugin. https://wordpress.org/plugins/wordpress-seo/
Yoast is one of the leaders in WordPress SEO. It’s a free plugin, and if there is any conflict with the theme, you will only need to delete the plugin and try out any free ones.
Hope this helps,