Co sleeping, position of baby advice please

[PintOfBovril]

I am intentionally Co sleeping with my baby (3 weeks old) and I wondered if anyone could clarify something about the baby's position duirng/after breastfeeding? Sorry if this is a stupid question. All the safe co-sleeping resources I've looked at have a photo or picture of the baby on their back next to mum. However my baby falls asleep on the breast and so do I... Which means the baby is sort of on his side and tends to stay there rather than roll back onto his back. Is this okay? If not how do you make sure the baby is on their back if they're on the breast frequently?

You’re supposed to very gently roll them over onto their back after they’re asleep. (In practice there will be times when you fall asleep, so roll them when you next stir.) When they get a bit older they tend to roll onto their back when they pull off the breast, as they get used to sleeping in that position.

I know it's so exhausting staying awake, but try to do so, so you can roll your baby back over when they finish, or gently try to remove them from your breast when they fall asleep, at least until they are strong enough to roll over unaided.
I co-slept with and breastfed both of mine to sleep too.