great/ what other plugins

Hello,
I installed this plugin a week ago and am getting a brute force attack on one of my sites and
They haven’t succeeded! I receive email al;erts which is great.

Thank you for this amazing plugin!

Question

Do you have a suggestion on what plugin would work best with yours to increase security on the back end?
Thank you Mary

http://ww.wp.xz.cn/extend/plugins/oop-plugin-template-solution/