I wish I could push my speakers against the wall and get good sound but that hasn't been possible with the loudspeakers I owned in the last 45 years. YMMV.
May I suggest reading the articles the op has posted then. That will tell you how to do it .
The long wall is rarely the best place because room modes are much closer together which makes placement difficult to impossible. Of course, if you are never treating the reflections off the side walls, then the long wall may be better to keep the speakers farther away from those walls.
The best nearfield system I put together had the loudspeakers 5 feet out into the room and the seat 6 feet from that in a tiny room.
Okay, we are already 11 feet to the seating position from the front wall. We are no longer talking about a tiny room as I certainly hope that seating position was not close to the back wall. If it was close to the back wall, then it was no where near ideal unless there was serious acoustic treatment on the back wall which can be quite difficult to do well.