Point "Create a Site" Links to Your Own Signup Page
Replaces the network's default wp-signup.php address in links and redirects with a custom page, such as a pricing or onboarding page, while keeping the real signup form available.
Snippet Library
Multisite snippets for WordPress
Snippets for WordPress Multisite networks: network-wide settings, new site defaults, super admin tools and cross-site tweaks. For network administrators who manage many sites from one install.
Redirect wp-signup.php When Registration Is Closed
Sends visitors who land on wp-signup.php to a page you choose (or the homepage) when network registration is turned off, instead of showing a bare "Registration has been disabled" screen.