Hi fixingmywp, I don’t use this specific plugin, but two-factor authentication is very effective at preventing malicious logins – including those from brute force attacks. It does not actually stop the attack – bots can still hammer away at the login screen – but they can’t login.
From the description page of this plugin …
WHY DO I NEED TWO-FACTOR AUTHENTICATION?
Botnets carry out brute force attacks against thousands of WordPress sites and blogs every day, regardless of size. Once inside, botnets infect your visitors with malware. A compromised website leads to delisting by search engines or blocking by your hosting provider. Rublon Account Security prevents such attacks.