Here is another approach to creating the physical geometry. It can be both smoothed or unsmoothed.
I have videos for two methods one uses a poly plane and chamfered vertex.
Method 2 we start with a polygon that will be the hole and build the unit square outward from the hole. The second method makes it easier to control the number of edges in the hole so that the model can be built without enough detail that it does not have to be subdivided.
method 1. https://youtu.be/0o5UjzWVrXo
method 2. https://youtu.be/heQs97o2V-Q
NOTE: Sorry a fumbled around trying to find the "center pivot" command. It was under "modify" and I just did not see it. I use the shelf and marking menu's and so I tend to have to hunt when I go looking for where thing are under the tabs. Normally I would have re-recorded but I was in a bit of a hurry.