This has been answered in many previous posts.

The answer is.. no one can tell you where Sub placement will sound the best in your room.

Just use an extension cord and move it around until you find a sweet spot.

Dont forget to use Trueplay.

Ever heard of the sub crawl? https://www.audioholics.com/home-theater-connection/crawling-for-bass-subwoofer-placement
 

Remember Trueplay needs to be redone with every moving of the Sub.