Multiple subs, placed asymmetrically should even out some nodes....bumps and dips.
Equalization will help for a small area at the expense of larger peaks or dips elsewhere. For a single listener, a single equalized sub should work. In my room, where I have the TV, I got lucky and have a wacky, 8 sided room with an off-center vaulted ceiling. I've looked (listened, actually) for bass bloom and suckout without much luck. I also crossover below 40hz and run my panels full range.....That, too, may help.
Equalization will help for a small area at the expense of larger peaks or dips elsewhere. For a single listener, a single equalized sub should work. In my room, where I have the TV, I got lucky and have a wacky, 8 sided room with an off-center vaulted ceiling. I've looked (listened, actually) for bass bloom and suckout without much luck. I also crossover below 40hz and run my panels full range.....That, too, may help.