Resonators tackle specific FR bands. every room will need wideband absorption at early reflection points.I use resonators in my own way to guide and change asymmetrically the driver and the tweeter direct wavefront of each of my speaker then differently for each ear and i use reflection to guide these waves to my ears in time...This help me to create this listener envelopment impression....
The 32 resonators distributed in particular locations with variable and orientable necks help me to control the timbre perception and imaging....I even use 3 cylinders without neck....
Like i said general rule are only that general rule...I dont go with a general rule, it is useless for optimization i did LISTENING EXPERIMENTS.... And the extraordinary results are only reach by some optimization of the resonators and of the reflection/absorbtion timing ratio...I cannot give a rule always the same for each room sorry....
Optimization ask for timing threshold coordination with reflection not only absorbtion...I used reflection at early reflection
What i do anyway is not for a living room by the way....
My audio room is ONLY for audio ....
But the most important luxury in audio is not the cost of the gear but a dedicated room....