The best tool I've found is the Isotek set up CD.
http://fatwyre.com/isotek-ultimate-system-setup-cd
https://www.musicdirect.com/accessories/IsoTek---Ultimate-System-Set-Up-Disc-CD
After using the CD, My soundstage is wider, higher, deeper and more precise. It took a few hours, but I wound up with my speakers CLOSER to the front wall and toed-in very slightly and my listening chair moved closer. The first time I used it, the CD led me to have my Left speaker toed OUT slightly and the Right toed in severely. It sounded a lot better than before; but it didn't sit well with me so I used the CD to help me arrange furniture and then the speakers again. Now it sounds even better. I re-use the CD every time things change in the room.