Each room may sound slightly different (before or after room treatment)
You want the path from the speakers to your ears to be as unhampered as possible. In other words, are sound waves going to bounce off of other objects in the room? If so, the first step would be acoustic foam or acoustic vinyl barriers to mitigate any undesirable effects of the room. Ideally, you want to create a private space for the system.
Carpet is good for audio gear! And with regards to 15 A or 20 A, do you see yourself using power amplifiers/mono blocks in the future? If that's a yes, then go for 20 A. Always better to have more power on tap - just in case!
You want the path from the speakers to your ears to be as unhampered as possible. In other words, are sound waves going to bounce off of other objects in the room? If so, the first step would be acoustic foam or acoustic vinyl barriers to mitigate any undesirable effects of the room. Ideally, you want to create a private space for the system.
Carpet is good for audio gear! And with regards to 15 A or 20 A, do you see yourself using power amplifiers/mono blocks in the future? If that's a yes, then go for 20 A. Always better to have more power on tap - just in case!