I personally don't consider anything taller than 26" for the front. It's not totally black and white, the wider the tire the less height you can get away with because of the backspace and turning requirements. And obviously ride height plays a big part. But with the typical backspace you find on 15" wheels and a stockish ride height I wouldn't expect those to fit without modifying the lower front corner of the wheel opening.
From the side with the wheels straight ahead isn't usually the tightest clearance to the fender. Typically the tightest clearance is with the wheels turned slightly, the innermost edge of the tire ends up farther forward than with the wheels straight ahead because of the width of the tire. Again, it depends on how wide the tire is and what the backspace is. The further in the wheel sits the better that clearance usually is. Alignment plays a part too, the caster and camber will effect how much the wheels tips on turning which also changes the clearance. Folks have even found less clearance when turning while backing up, the big rubber strut rod bushings (if you have stock style strut rods and bushings) let the LCA move a little bit forward under those conditions, reducing clearance.
