Unless you are mixing/recording music, or are part of the 5 to 10% exception, that is the opposite of what you want to do on walls. Modern psychoacoustic research shows side reflections to be absolutely beneficial.
However, there are ALWAYS two sides to this coin. As with many areas of living, too little of something is bad but too much of that something is also bad, too little oxygen and you'll die, too much and you'll die but also, 5% oxygen would be beneficial to someone hyperventilating and 95% oxygen would be beneficial to someone with a condition restricting their ability to absorb oxygen, so what is the right amount of oxygen to give to a patient? The answer is of course that treatment only makes any sense if you know what the patient is suffering from. If you went to the doctor and they prescribed chemotherapy without first finding out if you had cancer or that it was a type of cancer which responds to chemo, you'd sue them. The first stage of treatment must therefore be diagnosis because only then can you know what treatment will actually work. This fundamental fact is often missing from audiophile thinking, simply buy a treatment and apply it, regardless of both what "condition/s" require treatment and of what condition their treatment is designed to treat. To make matters worse, there often seems to be the belief that music recording studios are designed to be quite dry/dead and therefore any and all absorbing treatment is always good, as it gets closer to that "ideal". I'm not sure where that belief has come from but it's false, recording studios are typically designed to have a reverb duration roughly comparable to consumer rooms!
In short then, most of the advice given is purely speculative, no one here knows what problems you are actually getting at your listening position and yet they are providing absolute statements about what you should and shouldn't do? All the advice you've been given might work well, might not make any difference at all or might even make things a bit worse, depending on exactly what's wrong with your room in the first place. Additionally, you've just said "panels", which is relatively meaningless, it's like saying you've got some medicine; unless you know what's wrong with the patient AND what that medicine is designed to cure, it's meaningless. So, do you really need to reduce reflections or are you just saying that because you believe dryer/fewer reflections must automatically be better, what's actually wrong with the patient? And, what's the medicine you've got, what sort of panels, what are they designed to cure; are they absorption or diffusion panels and what frequency range are they effective at treating? You therefore really need to run some measurements and find out what's actually wrong, failing that, the next best advice I've seen so far is simply to get a couple of friends to hold the panels in various places and pick where sounds better to you in your listening position and to try various amounts of those panels (less/fewer can sometimes be more!). Blindly treating or not treating the primary reflection points (or anywhere else) is IMHO, the worst option!
G