WP fail2ban pre-installed in mu-plugins in a new DigitalOcean WordPress droplet.
WPf2b installs just like any other WordPress plugin - you need do nothing differently.
The Premium version installs via Freemius.
Activating WPf2b Premium creates two database tables:
wp_fail2ban_log
wp_fail2ban_plugins
WPf2b Premium never drops the database tables - it's your data.