I don’t use the term extreme, but I do use what DBX developed for home theater front speakers to get imaging across the full width for Video, and I adjust my music system toe in to something similar when it’s two listeners, both off-center. It is stable, just less wide if I leave them, and sit in the middle. I haven’t analyzed, but I bet there is some content that benefits from each setup.
DBX Cross Dispersion Method,
I made a virtual system to show it here
https://www.audiogon.com/systems/11516
Note: horns, driver types: my T350 horn’s mouths are specifically designed for wide dispersion with restricted height dispersion.
https://products.electrovoice.com/binary/T350%20EDS.pdf
your driver types will affect results, I use a CD with test tones and a SPL meter on a tripod at seated ear height at my listening position to measure what I am getting, and the results of any changes. I have a pair of L-Pads designed to adjust the mids to the woofer and adjust the tweets to the mids. You can see changes in specific frequency dispersion results, make a chart, take your time, take breaks, it took me 1-1/2 full days last time.
It's worth the work and patience, they never sounded better, and that applies to each and every musical selection!