1st thing, wrong forum(as in section) , second it depends
it depends on if you have a neck angle or not. If you have a adequate neck angle to keep the strings parallel to the neck , then routing the top to recces the trem isnt neccesarry, however if it is not made with a neck angle, reccesing the floyd is another options to keep the strings parallel to the body. though both have their seperate pros and cons (not only relating to if the strings are parrallel), that I, since i dont use a floyd, am not enlightened enough to elaborate, however there are many, more enlightened people on this forum that could elaborate more