Wavebox on a all glass 210

I have a custom 60*48*30 coming in April and wanted to do a wave box on it as well. I want to mount it on the back wall of the tank though. WOuld one wave box be suffucuent or do I need two for this tank?
 
It won't work very well this way, it really needs to be aimed across the longest portion of the tank, I do think you will need an extension.
 
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