How can I hang small driftwood in my snakes terrarium?

I found some sturdy driftwood that's perfect for my snakes cage (don't worry I cleaned it and sprayed it with mite spray). I want to use it horizontally in his cage but I can't figure out how to do it. His cage is all gl. I don't want to ruin the cage by putting anything sticky on it. What's a good sturdy way to secure it to my cage? Any ideas will help. I'm so lost lol