Set firewall on domain root

Hey,

thanks for this great plugin! You saved us all a lot of headaches!
Question, is there a way to set the firewall to the main domain – not just the login page? Example, instead of installing an extra plugin to block the access to the main domain https://app.example.com/ with an extra password, is there a way to use the firewalls Username + Password feature of the Ninja Firewall?

What we are trying to achieve, we want to universaly block access temporarily before finishing the development. Only people with the correct credentials (Username + Password from Ninja Firewall) would have access.

Thanks and best regards!