The room size and layout are not mentioned and will come into play, especially if one wall is far away or there are large openings to other rooms. Experimentation is your friend, even if you only have two physical locations you can place the subwoofers, try different orientations and see what happens. You may also need to experiment with phase depending upon if the drivers are facing each other or not.
When in comes to audio there are seldom right and wrong answers. The opinions of "experts" are just that, and should be used as a suggestion only. Remember at the end of the day it is your money, your system, and you will need to listen to it.