Lots of folks like the look of panels on their walls and put them there for not much other reason that they were told they were the greatest thing since sex and they assume their presence there will make the room sound better. It might. But there are a lot of ways of getting great sound in your room without them.
Get a book on room acoustics and read it before you decide to hire a company to tell you what you need and where to put it. FWIW I found they could be beneficial in treating first reflection points and dispersing the back wave of panels, electrostatics, etc.
Like all tweaks in audio you need to make sure you need them in the first place. Some folks don't use acoustic panels at all. I don't (I did though). I just figured out how and where to set up my speakers and listening chair and what kind of 'domestic' things I could use to deaden or diffuse room reflections. FWIW a lot of folks spend money trying to correct standing waves, as well as nodes and nulls in the bass frequencies. You will get recommendations accordingly but you can't kill/cure room nodes/nulls with acoustic panels. And also, the nulls and nodes that really count are those at the listening chair. Just because when you stand in the plane of two speakers near the wall you hear a big soggy bass doesn't mean you will hear that same boost at the listening position. Any way, FWIW. :-)
BTW, regarding your question, if you are listening at low levels you are unlikely to really need acoustic panels on your walls except on the first reflection point on the wall adjacent to your speaker IF your speaker is too close to that wall. You can solve the problem, if one exists, by simply moving the speaker or using more toe in.