Is it safe to use a feeding pillow on the floor for tummy time for my four month old? Thank you

Have you seen Red Nose brochure about Tummy Time?
https://rednose.org.au/downloads/RN0407_22_Tummy-Time.pdf

A soft pillow eg feeding pillow is not generally recommended to use during tummy time?
Do you have a specific reason for asking this?

Tummy time on a firm surface helps baby to build upper body strength.
How does your bub go with tummy time when awake?
Is your baby showing signs of rolling yet?

Does your bub sleep in a cot or bassinet &/or still being swaddled/wrapped?

Let me know your responses, especially if you are having difficulty with tummy time.