PPF on the entire outside is overkill and will cost you roughly $5-6k if not more. I would stick to just doing the high traffic more prone to chip areas.
For example assuming it’s painted and not chrome. Front bumper, panel underneath the headlights, headlights, hood…even partial hood is okay, grill (you shouldn’t have to worry about that since it’s a limited and not painted), partial or full fender, A pillars, roof cap, mirror caps (if painted), these areas will be where most of chipping will occur.
If your wanting to go with AT tires or wider wheels.. I suggest doing all four flares (if your limited comes with them), rocker panels, partial on the doors underneath the body line. Rear bumper wouldn’t be a bad idea if you tend to back in a lot and get close to bushes etc.
Yes to ceramic coating the exterior completely once PPF if applied.