Bedrails for co-sleeping 7 month old?

[Schoolworrier]

For part of the night I co-sleep with my 7 month old DS as we both get more sleep that way. I put him to sleep in his own cot (in my room but separate to our bed) and then when he wakes up to feed he comes in with us.

However, DS has just learned how to roll and I've woken up a few times with him about to fall out of bed (this is when DH has got up for whatever reason.) I've been considering buying bed rails so DS won't fall out, but not sure if they're safe. Interested to hear MN views.

We set up the double bed in our spare room with bed rails each side and along the bottom. We've been very lucky as it's only been a handful of times we've needed to use it but it's done us a great job.