Does the job. No more, no less.

I tried some other F2B plugins, tons of useless options, useless interface and so on. And very expensive paid subscriptions, of course.

This one just logs all the auth. failures you need to monitor and gives you the F2B filter and jail conf. Install, copy, adapt, reload f2b. 5 minutes and you’re done.

Be sure to add this plugin as a “mu-plugin” (must-use), so no stupid WP admin user disables it by mistake.