Never tried it that way, but I don't plant bush beans - too much bending over. The pole beans I space ~10" apart on a line close to some sort of trellis - I use cattle panels.
Great yields that way but they still turn into an impenetrable mess by the end of the growing season.
I like pole beans but I have problems with Green June bugs and Japanese beetles. And yes, they get into an absolute tangled mess. In spite of the lack of room I am going to try bush beans again.