If you already have your own test setup/teardown in your suites, which from the looks of it you do, there is not much you can gain from the FailSafe plugin.
The FailSafe plugin is useful in situations where the Setup of your System Under Test is costly or takes a long time such as starting up a Servlet or a distributed system. The way the FailSafe plugin comes handy in these situations is that you can set up this environment in the pre-integration-test phase. This plugin also doesn’t stop the execution of the Maven build when a test fails, which allows you to clean up all of your artifacts during the post-integration-test phase, after which it checks the status of your tests and passes or fails the build accordingly during the verify phase.