A few years ago, we used to have one of those 4 tier greenhouses that had a zip opening front to it. The cover has long since gone but I kept the shelves. This year, in my bean and pea bed, I have put them between the rows of broad beans:
Up these, I am planning on growing dwarf peas, with just one one row sown each side so the bed doesn't become a tangled mess.
Hopefully it works as I don't really have access to twigs to support any peas. The net covers are temporary to keep off the pidgeons until everything gets a bit more established!