With WP Client Reports Pro, you can add a new section to your report that gives you and your client statistics about the forms on their website. The plugin tracks daily views and for each form on your site so that you can get an accurate picture of the conversion rate within a period of time and how they are performing.
Ninja Forms is a popular WordPress plugin with a freemium model that gives you the base plugin and allows you to add in pro features ala carte. It has a helpful drag and drop interface where you can build and configure a form in minutes. Many more advanced features are available from their marketplace.
There is no set up needed once you have both Ninja Forms and the Pro plugin installed.
Read more about how Form View Tracking works with this F.A.Q.