The rear-firing port does not suffer when placed near a wall, as long as it is at least 1/2" away. It can't be completely touching the wall, but it can be pretty dang close. Is that what you are asking?
No. I have no wall in our open floor plan home for them to be in front of. So the port on the left speaker would fire into the kitchen. The other into a large dining room family room.
The only wall is a wall that is the same width as our TV. Below this is my center speaker, audio equipment and sub. We sit against a back wall about 8 feet from the tv.