Per https://docs.testing-farm.io/Testing%20Farm/0.1/test-request.html#multihost-testing the Testing Farm now supports tmt multihost testing using a new pipeline type "tmt-multihost" when request new tests. But looks like it won't work if the provided test list is mixed with multihost and singlehost testcases.

Here request a feature to adapt the testcase's requirement to enable the multihost tests automatically.