It might be worth mentioning that method 2 also works for individual lements in a layout used in an archive loop in Divi Machine. I wanted to vertically center titles, regardless of whether they wrapped onto more than 1 line. This is complicated using the single layout of course, but method 2 did the trick.

I had to apply it in the Divi CSS rather than in the element itself, as the Post Title block defaults to H1, and I wanted it as H2, but it works beautifully with a custom class.