If you're running vSphere 6.7, when you enable EVC mode (or just edit) in the GUI it will show you if hosts are or are not compatible with the EVC mode selected.  Start at the highest level (Skylake) and work you're way down until the Compatibility section shows there's no host that have issues.  I am used to looking at the Compatibility Matrix, but it can be confusing and overwhelming to someone not used to it so I'm glad that they added this check into the GUI.