A 3-wire circuit with a two-pole GFCI should work the same as with any other 240V GFCI CB installation.
Interesting and opposite for comparison would be when a dead front GFCI is used to feed two single-pole switches with one 3-wire for a bath fan/light combo over a tub. It would seem reasonable that there could be a problem with nuisance tripping, but since they are fed from the same 120V circuit, there is normally no issue. Although… I have heard that excessively long runs of the 3-wire in this instance may cause problems.
