Why not try it in a few different locations, run Trueplay each time you move it, and let your ears decide the best location?

Subs can be picky about location, depending on the room. One of mine is happy sitting in a corner with the openings facing the walls. In another room similar placement got me boomy sound at some frequencies and it is better flat to a wall a few feet from the corner.

If you have an acceptable Apple device TruePlay is a good idea. Maybe borrow one and try a few locations if you don’t own one.