Is it possible to generalize configuration of "prepare-agent" goal and move it into the parent? For example:
```
<configuration>
  <destFile>${project.parent.build.directory}/${project.artifactId}.exec</destFile>
</configuration>
```
IMO this will also make it more realistic - indeed, expected that in real projects jacoco-maven-plugin configured once in parent and this configuration reused in sub-modules.