i would go for hinging both sectionsd from the bottom, makes folding flat less easy but it means all the load dwn would tighten both hinges. I’d consider corecork as your ‘washer’ on the end of each panel. if the hinges were more like clips and not connecting the pieces then i guess it would be easier to lay the sections down on top of each other but maybe the wire would then cause problems.
cheers
rich