Audio Treatment- GIK Acoustics Soffit Corner Bass Traps

I have them in the four corners floor to ceiling in my house of stereo. You can see them under my system. Bought the ones with the limiter, they do not absord frequencies above 650 hz if I remember correctly. Not sure about your room size but a must in mine.

Your room mode is likely created by the 10’ long (not sure which of your listed room dimensions are depth vs width) wall-to-wall distance. 

10 ft dimension => 56.5 Hz room mode

If the 10’ is the depth of your room, putting bass absorbers behind your speakers and behind your MLP is the solution.

Corner bass traps will help with bass peaks and corner buildup but not necessarily address you "58" Hz (56.5 Hz mathematically) room mode. (They can still be a good idea for other reasons.)

Yes, I have 8 of them. Do they work? Absolutely. 

As others have pointed out there are frequency specific traps tuned to that particular resonant frequency, but should be pursued after treating the room generally first, from my understanding. 

Here is a good question, have it answered by someone who is not guessing but by someone who truly knows acoustics: Within reason, can a person have too many bass traps?