Hello,
As per the Probe Compatibility Matrix of July 3rd, 2017, unfortunately the "cluster" probe (last available version at that time is v3.42) is not supported under Red-Hat 7. It doesn't mean it won't work (and I didn't test that) but it's officially not supported. If you need more details on the ongoing plan, you need to open a case.
Hope that helps.
Christophe