Do you have enough confidence in your excellent UI design that you would opt for the simplest scene to present it? I suggest you check this PSD mockup created by Anthony Boyd Graphics that shows an Apple Pro XDR display.
Although it has almost all colors on its screen, it is standing in an entirely blank environment. The preview images show this device in both portrait and landscape positions. You can select which one fits your preferences better. Be sure that your design will make a splash by inserting your graphics on this front view screen. What else do you expect from a mockup?