Yes, you totally can do it if you want to. What I meant is that that kind of CGI scene composition does not include a glass sheet on the surface. They used it to add the reflection to a checkered pattern instead of trying to find something like polished marble.

But if we found a thousand different versions of that scene in CGI, I would bet that every single one of them would use a checkered pattern plane that's slightly reflective. Maybe even uses marble subsurface scattering. But none would add a sheet of glass on the plane as a not-forced modelling choice. That's what makes the photo identifiable as a photo.