Just a row of canes here for my many years tried and tested Painted Lady that produce tons of tasty runners every year without fail.
No more than six foot out of the ground for the poles, so 7 foot poles.
Always tease them across the top poles when they reach the top of the canes, then they do not start their way back down too much.
Runner beans would not be good grown up a wigwam, as they are so productive. Wigwams are a better ploy for french beans, but not for the like of Cobra that are so productive and need a row of poles.
That munty one looks weird, not seen that before. Not sure I would want to be crawling through and underneath that. Suppose you have to careful to tease them up and across that.
Also, that looks more like a permanent structure, so must limit preparing the soil below, that runner beans love with all your scraps and compost dug in out of their season.