Hi Mitch. I wouldn't worry too much about flow and placement of powerheads or wavemakers. IMHO, unless you are doing serious flow, like 50 turns of the tank per hour, flow is fairly easy for most corals to deal with. BTW, my 90g DT has a similar coral population to yours (60% zoas, 20% lps & 20% sps)
You always hear that zoas don't need high flow, and they don't. However, they deal with high flow quite well. The only coral in your tank that I think you need to be careful about in terms of flow is the torch. And it will tell you if it gets too much flow.
In general, I don't thing high or low flow is as important as some kind of randomized flow. Something like 2 or 3 wavemakers, working at random, which will keep things stirred up in the tank. After that, any medium flow rate is fine.
Do you already own the powerheads or wavemakers you intend to use?
Have you calculated the total flow (number of turns) if you ran them all at full speed?
I think if I were in your position, I'd be shooting for about 30 to 45 turns per hour.
BTW, I'm assuming you are familiar with how to calculate the number of turns in your tank. Return pump (gph) + powerheads (gph) divided by DT water volume (g) = turnover
Example: 1200gph + 500gph +300gph divided by 50g tank = 40 turns
I consider 40 turns to be at the high end of the medium range or the low end of the high range.
I hope that helps?