An OB that close to the wall is doomed to failure IMO. I have built a pair of MJK's small, passive OBs. They sound fabulous about 3' from the front wall and 2' from the side walls. Closer in, bad things start to happen in the mid-range, never mind the bass.
And as has been mentioned, they would need baffles of significant size to get down anywhere near 100 Hz.
Cheers, Jim