AWS GuardDuty
Fluency offers several CloudFormation scripts to facilitate integration. While these scripts are free to use, keep in mind that AWS CloudFormation is a paid service, and you will incur a charge from AWS for using it.
AWS CloudFormation allows you to configure AWS resources from script/code. This makes deployment easy, consistent, and greately decreases the possiblity of errors or misconfigurations.
For supported AWS integrations, deploying via CloudFormation is always recommended, if the script is avaliable.