Where to add `dependencyGuard{}` closure in project with multi modules & flavors?

For example, there are 3 modules in my project: `app`, `utils` and `feature`.
In `app`, there are also 2 flavor: `dev` and `prod`.

So, where should I add the `dependencyGuard{}` closure? In project-level `build.gradle`, or in all module-level `build.gradle`, or only in `app > build.gradle`?

And moreover, should I update `configuration("releaseRuntimeClasspath") ` to reflect the flavor? It means `configuration("prodReleaseRuntimeClasspath") `?