I have some cukes grow at 45 degrees.
This photo is a test, made from two flat screens of welded metal wire, with stakes to hold them in place & wired at the top were they touch. I worked very well & I will take photo's for it in use next Spring.

You can move the stakes to any angle from 180 degrees flat on the ground to 90 degrees with no angle at all.

I've had a conduit trellis for several years, and it's doing fine. As for rust, it's the iron oxide, not harmful to plants. The rust that is harmful to plants is a disease that has nothing in common with rust on metal. I plan to soak the netting in a bleach solution beofe using it again because of disease problems this year.

Here is a link that might be useful: tomato support