A higher mounted scope gives a trajectory advantage down range, for the 55 yard targets. For turret diallers, it allows all ranges to be dialled for within less than one turn of the turret (depending on zero range).
My scope is mounted just under 3 inches high and I can dial from 10 yards to 55 yards within 46 clicks, zeroed at top of trajectory. This prevents being a turret turn out when/if the shooter forgets the return to zero after the shot.
If you're thinking of adding a high mounting rail, get one with MOA milled into it to save you having to shim.
I have an FTP. Don't give it a second thought. Get one, you won't regret it. All the fuss is in the past now. Six months ago, there was one at my club. Three were shooting with them last week!