Where can I find more information on baby lounger type products? Are these sleep safe?

Red Nose recommends that baby is placed for sleep on a firm, flat - not elevated, surface with their head & face uncovered.
Pods/nests/loungers are not recommended, as many are soft & padded & may create a risk of suffocation, especially if baby rolls. Some also have an inclined surface.
https://rednose.org.au/article/firm-and-flat-is-safest-for-sleeping
https://rednose.org.au/article/why-is-sleeping-babies-on-firm-surfaces-so-important-and-what-are-the-risks-if-you-dont