I'd set it wherever you get the best coverage from one end of the oscillation to the other. I have mine in the back middle of the tent because that's the only place it fits with my setup. It covers the front 3/4 of the tent, but along the back wall it's lacking. Oh well, it's the best I can get at the moment. It would probably be better in the corner but I just don't have room. I also have it set on a small platform so the column of air extends from the soil level to roughly the tops of the plants (depending on how tall they get), then I have a couple fixed fans circulating the air above the tops.
IMO, oscillating tower fans are better than having multiple fixed fans. You don't have spots that are constantly getting bombarded by wind, and you reduce the number of "dead spots" where little to no breeze gets.
The one complaint I have about mine is that if I lose power, it doesn't automatically turn back on when the power comes back. My last one had a rotary knob for speed and a mechanical switch to turn the oscillation on and off, so when power came back on it was set the same way as before. The oscillation motor on that one eventually died, and the new one I got has soft buttons and a remote control, which is what it looks like yours has. Just something to keep in mind...