Tick
Footballguy
Here's the first set of rankings I've seen that are FF-focused. Pre-draft, so I'm sure these will change a lot:
rotoheat.com
Honestly, I don't do much IDP prep before the NFL draft. It's just too painful to decide you really like a guy, then see him made worthless in your league position/scoring system.
Biggest questions I have every year:

Rookie PPR and IDP Combo Rankings (2023) - RotoHeat
RotoHeat's 2023 Rookie PPR and IDP Combo Rankings are here for all of your upcoming drafts leading up to the NFL season.

Honestly, I don't do much IDP prep before the NFL draft. It's just too painful to decide you really like a guy, then see him made worthless in your league position/scoring system.
Biggest questions I have every year:
- Does a safety project as a deep or box player? Somewhat team dependent.
- Does a linebacker project to 3 downs? Team dependent.
- What scheme does an edge land in? Team dependent.