Sorry, slow to get started this morning.
Yes, I did QA testing with mod_security on, at one time, but not since I changed to a new, faster SSD in my server and put Centos 7 on it.
I installed it with, yum install mod_security mod_security_crs
You jogged my memory some more with the liquidweb link...I do remember whitelisting my site to get it to work. Still got to dig out my handwritten notes, but am 99% sure that is what I did.