Hello and thanks for the module

I just installed the module to try stop spamers for my site, but I think I am not using it well, so I came to ask for support.
I have installed the module Rename Admin Paths that allows to me to change the user path. So I get a 404 error in user/register. I would like to ban the ip from that type of users/bots but I think rules detects the 404 page instead of user/register. I am using the event Drupal is initializing. Is there a way to be able to make what I say with this module? Thanks