Rainforest dragons are great. They would do well in an enclosure that big as a pair. Need little heating and you can add a small pind and some live plants if you wish.
I have a 900x450x1500 (LxDxH) glass cabinet with sliding doors and i plan to put some in. Hatchies need a smaller setup but it will be great for a trio. I even considered putting my jungle in their but thinking i want to keep temps up a bit more so i am building a melamine one of similar size, slightly deeper.
Rick