You may find the below video helpful for reference. Another option is to measure the 700/900 separation between its arrays you have there in the middle and follow suit since they are somewhat close in design.
Personally I had my a360x's mounted on 80/20 rails so I could move them easier until I found what works best for my display. Apologies for not having specifics but it is somewhat unique to mounting height, the coverage you are looking for, PAR numbers, and of course size of display. I had mine mounted 8" above the waterline as my display is 30" tall.