Did you by chance purchase the chameleon kit?
If you did, a lot of the additional items are unfortunately unsuitable to a chameleon's health and longevity.
This video offers solutions and guidance and will help you immediately and details why it is not sufficient at raising chameleons. Namely, the size they will quickly outgrow, and the dual light and uvb coil bulb will not encourage the correct growth of their bones. They need a linear uvb bulb, it's absolutely necessary! You'll want to look into either the arcadia t5 6% or reptisun 5.0 t5hO uvb lighting kits asap, if so.
To answer your question,
this is a video I followed for inspiration. I have the zoomed reptibreeze XL and used fishing line and zip ties to secure everything without purchase of Dragon Strand's very helpful but a bit too expensive for me at the time, Dragon Ledges.
Here's a recent pic of my set up. The integrity seems good, and nothing has tumbled yet *knock on wood*
If you are unhappy with screen enclosures, you might consider
hybrid enclosures. Be mindful that the material does bump the price up significantly, but the product is very sturdy and will last a lifetime.