I tested in CentOS 7 & Kloxo-MR, since Redhat has patched Bind, it works:
I appended the following to /opt/configs/bind/conf/defaults/named.options.conf right above logging {..
rate-limit {
responses-per-second 5;
window 5;
};
[root@kloxomrc7_01 csf]# systemctl reload named
Seems not to complain about anything.