Flight arrives FCO 11:00 and hoping to catch the once daily Trenitalia Frecciarossa 'direct' (no train change, only stop is Roma Termini) at 13:53. Will be prepared to buy the tickets via the Trenitalia app while waiting in Customs or whatever after landing. Seems like there should be plenty of time, yes?
Not terribly concerned, as there's a 1 stop/change at Termini departing 14:23, and of course lots of Leonardo's with other Termini-Firenze Frecciarossa available after that. But sorta nice to know the plan is sound. :)