eruji -- both types work fine, but I find the ones with the knobs below a little easier.
Whichever way you go, I'd encourage you to get staggered height tuners, as the RT has a straight headstock. If you don't get staggered height (shorter for the high strings) you may have to use
string trees which can contribute to tuning problems. Otherwise, you may not have enough break angle to give you a clean, strong tone. I don't know why, but this is a particular problem on RTs -- I have 5 of them.
Bert