This is a shelf that can be used to sit a Roku on top of a TV. The stl is currently configured to support a Roku Premiere, but I'm sure it could support many other types of set top boxes. This is also configurable in customizer, so you can use it for other sizes of boxes or TV thicknesses.
I created this thing based on the design here:
I wanted to advance the design above, using OpenSCAD and provide a customizer interface for it in the process.
Hope you enjoy.