I'd love it if others showed up and did my job too...
Seriously, look at the designs for a couple of the F7 and H7 DISCO boards which implement PoE (schematics/BOMs online)
Better might be to find PoE solution vendors with new/current designs (getting more popular, deployed, low BOM count/cost) and graft their reference designs into you PHY topology, or get their FAE to sketch out or propose a solution.
The F107 is very old, this might constrain some of your choices. ie workable PHY, still in production
