Are the Safe Sleeping Baby Hammock and the Roll over Baby Pillow safe for babies to sleep in?

Red Nose recommends that the safest place for baby to sleep is in a cot that meets mandatory Australian Standards.
The mattress should be firm, clean, well-fitting & flat (not elevated)

One safety concern with the hammock is that it holds the baby in a curved position, this may cause baby’s neck to flex forward which may block baby’s airway not allowing airflow. A baby needs to be placed to sleep flat (not elevated or curved with chin on chest) to maintain an open airway
There is also a risk of injury or death from falls.
https://rednose.org.au/article/hammocks

Are you referring to sleep positioners when you mention “roll over baby pillow” ?
Red Nose does not promote the use of products that restrain the baby in position

Products that restrict the movement of a baby or a baby’s head should not be used.
This is because there are no Australian Standards for these products and case studies have shown that these products can be unsafe.
https://rednose.org.au/article/is-it-safe-to-use-products-designed-to-keep-baby-in-a-particular-position