What's the optimal set-up/background for a Zoom meeting or interview?

Ideally, the background should be clean and clutter-free. If you can't find a suitable place in your home, your local library, a coffee shop, etc, then sub in a blurred background, a solid color that flatters you, or a "professional one" like an office/library with books or the like. You don't want to choose something that screams for more attention than you - You are the focus and you don't want to distract the interviewer from your message.