Yes, they do need f-spaced, BUT always double check by finding a spec sheet of the particular trem your looking at. Look at the String Spread, then compare to the pickups string spread. They shouldn't be exactly the same though, because the pickup isn't that close to the bridge.
Ibanez has a myriad of floating trems and I'm not sure about all of them, but 99% of the time: locking trem = f-spaced.