If you are anchoring between two of them.
You may need more than one and cucumbers tend to send shoots out so they need something to grab onto. May need to make some sort of trellis with some sort of line for cucumbers to crawl up. I would suggest one bamboo trellis per plant they don't take on much weight.
Yes, bamboo is hollow . If you want something similar that's not, you might want to use kraft sticks or try a lumber yard.
Only if the decorations are very light.
Yes, it can.
They were sold as a pack, great and best price for these. I tried to order these last year ,they sold out before I blinked.
No, actually the measurements were correct. Very pleased.
1/4” and thinner