Hi
One was to achieve this is by using dedicated Policy Packages.
Define a new Policy Package containing just Threat Prevention, calling it for example ATP-Strict_Security.
You can also add just the relevant Security Gateway to the Install Policy Targets for the specific policy.
Then in Autonomous Threat Prevention select the relevant profile, in this case Strict Security.
When you install this policy, it will only load the Strict Security Profile on the specific Security Gateway "attached" to the Policy Package.