I have a 6 foot peninsula and I have one jebae cp90 crossflow top left on the end pulsing across the surface. This causes a gyre affect. Then I have 2 other powerheads at the other end half way down. One is a cheap 3000lph powerhead on constant blasting against the flow of the cross flow opposite. This causes turbulence . Then at the same end I have a reef flow 15000lph blasting right the way across the centre of the tank again clashing with the gyre and disrupting the flow. This turns on for 15 seconds and off for 15 seconds but is only on 10% power as its too strong.
A big gyre like the jebao cp90 or cp150 would do your tank well with an additional medium jabeo powerhead down the opposite end on random mode would be a great starting point for you. I'm a fan of jebao. Great value.