I've used a lay box with great success. Your way will work too Danya. I had a group of girls all using the laybox, until one decided she didn't want too. After she got away with it a few others thought they would too

It was okay though as they were all laying a week or two apart so it was easy to keep track of whose eggs I was finding!
If you have potted plants be careful with them as well. Cresteds will dig right to the bottom!
Just have a general day that you know your female is laying and keep an eye on her! Good Luck!