If it sounds great then leave it. It looks like it is already next to one wall so you get some reinforcement. It does look like it would be cramped behind the TV. The sound would get out however. Basically you will gain SPL. So if you find that you want more SPL or that it is struggling then you should try it out. My sub, not an SVS is not in a corner either. If I really wanted to I could do it, but like you it would be a tight fit and I would have a hard time getting to it. Mine sounds fine where it is. I would say just leave it. But if you are losing sleep, then just take a few hours and test it out. You may not even like the way it sounds. Mike D
I agree if it sounds good then thats a great start. The question I kept asking was can it sound better if I move it elsewhere? Warning it may open a can of worms.
You need lots of time, lots of patience, an spl meter, warble/sine tones and pen/paper. These are your best friends for fine tuning positioning. Initially with setting up my VTF subwoofer I used a long power and interconnect cable so that I was able to start in one corner and work my way right along the front wall. Then I moved and recorded each position along the side walls. In the end I settled for 1/4 along one side wall, as putting it in the corner excited the room modes too much. It took a while to find a balance but was worth it.