Hi, nice plugin !
If anyone has fail2ban errors when adding the [wordpress] jail , here is the solution for /etc/fail2ban/jail.local :
#default action, send mail
action = %(action_mwl)s
[wordpress]
enabled = true
filter = wordpress
logpath = /var/log/auth.log
port = 80, 443
maxretry = 1
bantime = 86400