I put mine right dab in the middle of my plants hanging at canopy height. I have a standard T6 controller and I also have a second wifi/bluetooth controler ganged with it so I can see what the tent is doing without leaving the couch or when I'm at the office for my work day.
How do you like the new 67? I'm running both a T6 and an S6 and I wish the 67 allowed you to reamp up and down different settings for both fans rather than just the same settings.