A few questions regarding powerheads

I would just count your powerheads towards your gph count just because I feel generally having more flow is better than less. It's not an exact science either, these are just guidelines to give you a general idea, it really depends on your coral, the placement of the coral, size/shape of the tank, shape of the rockwork etc.
Have you thought about maybe redesigning your rockwork or the placement of your current coral to better accomodate powerhead placement? That might be better to do after you get the Koralia's though, just something to keep in mind.