You can grow them on about anything they can climb. Some guys here have been pretty creative about their low horizontal trellises, lines on pulleys they can keep lowering, and so on. There has also been a post here about somebody's grandfather's farm's long-ignored hop growing as a massive bush, ignored, with nothing to climb for decades. The bines will grow on commercial trellises to 18 or 22 feet. They have been known to grow to 30 feet or more if given a chance. I suspect the height has more to do about cost-effectively maximizing yield per acre. With 900 plants or so per acre, they can't spend too much time with each plant. Building 18 foot trellises is well known here. In Germany they may be 7 meters. A 30 foot trellis would be more cost - and risk! A concrete arch doesn't sound commercially viable, but if it works in your garden, go for it!