Apache logs
Example that rules loaded: (error.log)
Thu Jul 14 22:03:54.081585 2016] [:notice] [pid 2781] ModSecurity: Loaded 155 rules from: 'https://rules.malware.expert/download.php?rules=generic'.
Testing rules
https://our.own.domain/malware_expert_test_rule
Example result 406 not accepting: