Actually, every dojo has a shomen, and every dojo has a kamiza. It just depends on whether those who use it recognize them.
Shomen 正面 is simply "front". Wherever is decided to be the "front" wall of the dojo, that's the shomen. Typically, it's the wall opposite or farthest from the entrance.
I know of a dojo that takes their Shomen and Kamiza [ I think that would be the correct terms ] as a front Corner instead of a wall.
Which makes the 8 way exercises kinda confusing