I added the /etc/httpd/conf.d/00_mod_security.conf file. As configtest gave me a double load of mod_security2 and mod_unique_id, I didn't add those lines but sticked to the lines in /etc/httpd/conf/modsecurity.d/rules/tortix/plesk_init.conf:
#ATTENTION!
#
#DO NOT MODIFY THIS FILE BECAUSE IT WAS...