under the porch might be a really good place. I doubt that dogs running by will probably not disturb them. Make sure to put dead grass underneath the pot and good luck attracting the bumbles. You could try putting them right in the garden as well. They may not move in until next spring though.

fyi, they seem to prefer the north side. bb's are fairly peaceful unless agitated. i have had them nest in the shed. we "walk" in together and i have never been stung. the entrance to their nest was also at the top right corner of the doorway. so, even though i was "in" their nest, they didn't feel threatened.