Generally we recommend placing the subwoofer in the front of the room for best blending with the main speakers and center channel. Start with a corner (which excites all room modes), and only move away from the corner if the bass quality at the listening position it not optimal.
If placement in the front room is not preferred or possible, then we recommend the ‘subwoofer crawl’ technique. Place the subwoofer at/near the main listening position, play a familiar soundtrack with a repeating bass line, and then evaluate the bass quality at each available subwoofer location in the room. Keep your head at/near knee level while listening. Then place the subwoofer in the location which provided the most accurate and balanced sounding bass.