That tool appears to just tell everything on the site to process through zlib; you can enable that same functionality in the Control Panel at CP -> Master Settings -> Primary -> Advance Settings
Enable Zlib Data Compression
This will result in smaller page sizes, but could add to overall server load. An explanation of zlib data compression.
CloudFlare does a pretty good job of blocking bad bots, and it's easy to blacklist entire countries if needed and is easy to detect by looking at bot traffic in their dashboard.
