Does the camera need to be level?

As long as you can 'eyeball it' so the camera is visually level you're fine.

Using an actual level (either a bubble level in the QR clamp or a simple horizontal level) is fine but unnecessary since the Matterport camera can tolerate up to 15 degrees off level. 

Remember to invest in a high-quality, professional tripod and clamp. Learn more.

Low quality tripods and clamps (such as ball-head mounts) causes most hardware-related scanning problems.

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