They are ok being at the lower end of high PAR, around 200 or even slightly lower. Mag helps them colour well.
Positioning is a bit of a balance. As they grow they will shade what's underneath, so you wont be able to grow much below them, unless you opt for NPS. So choose a well thought place in your tank, maybe half way vertically so ur not wasting all the space below it due to shadowing. You can probably go even lower, but that will depend on your lighting level settings.
If you have other corals that strive in low PAR <100PAR that r towards the bottom of the tank, then you will have to decide what PAR you want at what level to suit the various corals you may already have.
My favourite is the deep purple colour.