Egg nesting box placement

[hungba]

Hi! Can someone please tell where in the enclosure to put the female leopard gecko nesting box for egg laying?

Hot side, cool side, middle, does it matter?

This is how I have it now, it is the cool side. There is a normal rock hide on the hot side as you can see the corner of the photo. Is this correct?

[hungba]

Also is my nest box the correct size?