One of the main advantages of NOT HAVING A LID(is that ok?) is that you dont have to worry about the gecko escaping when you need to do something in the cage, like cleaning for example.
I have a little container with airholes and substrate that I put him in whenever I clean or rearrange his furniture. He doesnt try escape. In fact, when he's up on the sides and I open the lid, he runs back down to the bottom and doesn't try get away.