Subwoofer positioning doens't have to be debated. If you have REQW and a good microphone with a phantom power source, you can run sine sweeps to find the smoothest FR. Most typically, the corners of the room grant bass boost at the cost of bass frequency linearity, centers of walls compromise bass loudness for better bass linearity, in between the front speakers allows for higher crossover frequencies while allowing for good stereo integration and blend of subwoofer/loudspeaker.
In the standard shoebox dimensioned room, the reciprocity rule works for placing the subwoofer. That is, if you place the subwoofer at the listening position, you can sweep sine waves and test candidate spots around the room to find the most frequency linear area. This spot is optimal for subwoofer placement. It is that easy. This method also minimizes the amount of backbreaking subwoofer moving.
Do it right, do it once.
I would wholeheartedly agree with Rudeguy and get your setup away from the corner. Standard TV on width-wall with speakers "firing" down the length works best, is a well-tested model, and is easier to predict the influence of soundwaves within the room.
Here is an example layout that would work much better including 5.1 sound.
MSPAINT