Perhaps, buy a 100-200 watt range quantum board and use the AutoCOBs to fill in around it.
I and many others don't seek to place quantum boards lower. The boads, just like COBs, work very well when high(er) above the canopy. Many exemplary AFN grows use quantum boards set at 6 feet or even higher.
Rather I start all my lights (e.g., HLG-300Rspec/260 watts and Spider Farmer SF-2000Pro/200 watts) and 4-6 AutoCOBs at about 1 meter/40 inches above ground/sprout level at 50%-60% strength, increase to 100% after about 2 weeks, then progressively lower all the lights (kept at same level) down to about 18-20 inches above at/after mid-bloom.