I'm new here today. My male corn is almost 5', my female is around 4'. Both were skidish and scared when new and the size that yours is now. My biggest fear wouldn't be hiding as much as escaping at that age. Check for the snake daily in the tank. My female would escape when she was little, even with a brick on the cage. She'd climb up a hanging plant and wedge herself into the roots.
I know that some fish and some reptiles, feel safer with more places to hide. I live in Colorado and large river rock makes great cavework. I've also purchased many pieces of decorative aquarium driftwood and a couple of branches with numerous sub branches for climbing. Don't use wild branches without curing. They can contain insects and parisites. So, only store bought wood!! Granite and quartz can be well scrubbed.
Now days they are all over the cage/tank. different place every time I look and sometimes doing laps. In and out of rock work up and down branches. My cats love them.
