I've tested this tactic for a few games midseason with Sevilla, so plug and play. It did well. It got me curious to see how it performs on a full season, so I might start a new save. From what I've seen, this isn't for underdogs, because I struggled a little bit against Barça and Real Madrid. You have to have good players, specially in defence, for this to work. Nonetheless, I think this tactic has some potential.