There are Google Analytics plugins that have been created to allow for tracking, statistics, etc. for WordPress sites.
These plugins can provide quick access to in depth reports and a dashboard for easy views of statistics. An example of one of these types of plugins is named MonsterInsights. We have not developed these plugins ourselves but they can be found in the WordPress Plugins Directory.
Or, you can consider placing your Google Analytics code on a WishList Member Registration page.
You can customize the registration page for a Level by adding HTML above and/or below the form.
This can be accessed in the Setup > Levels > *Click on Level Name* > Registrations section of WishList Member.
The option to enter HTML above and/or below is available for each Level.