How to make "pmpro_account_preheader_redirect"go to the homepage

Hey all,

Here’s the code I’ve added to my functions.php to change the redirects:

add_filter('pmpro_account_preheader_no_user_redirect', site_url);
add_filter('pmpro_account_preheader_redirect', site_url);

I’ve also tried many renditions of the second parameter to no avail. What do I put in the second parameter to make it redirect people to the home page?

https://www.ads-software.com/plugins/paid-memberships-pro/