I hardly think Dante is a reliable source of either current scientific information or, more importantly, of Catholic dogma. St. Dante? He’s not in any martyrology.
If the correct answer to FE or spherical earth were necessary for salvation, Our Lord and the
Magisterium would have made it clear.
It’s an interesting question, as is heliocentrism vs. geocentrism. What, upon saving our souls and arriving in Heaven, the answer turns out to be “none of the above?” Perhaps it’s something our earthly minds are incapable of understanding?