Re Quanergy: Although the Quanergy site claims all their units have no moving parts, a university in France which evaluated their M8, the only thing they're actually shipping, writes this: The Quanergy M8 LIDAR system consists of 8 2D line scanners located on a spinning head which can spin at a rate from 5 Hz to 30 Hz. The 8 lasers are spread out over a 20° vertical field of view (FOV) and the entire unit rotates to give a full 360° by 20° FOV.[1]

[1] http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.n...