how far should i place my ScRoG fence above my plant in a 31gal rubbermaid?

The title says it all, how far above my plant should i place my scrog fence to be most efficient? ive tried to find people with the same scenario, but everyone stacks the Tupperware, which is a complete eyesore imo. The rubbermaid i am using is 31x19x17 in inches; my 3 gal smart pot is about 8 inches tall. and im also curious on how low i should place my lights for just one plant? they are the feliz 125w 6500k an 2700k . thank you for your help :leaf:
 
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