Even outside FPTP it's pretty iffy. I forget the exact quote but Chris Selley said something like "I would believe that a centrist party would do well under PR if it weren't for other countries and their politics." Managerial centrists aren't exactly running up the score in Italy or Denmark.
In all fairness, managerial centrists have basically been running the show in Italy for most of the period since 2011, in spite of election results. The secret is not necessarily to do well, but for the parties either side of you that oppose each other to do sufficiently well that you end up as the necessary pivot for any government formation.
