Should baby stay downstairs with you to prevent SIDS

[Bodicea]

I know the advice is 6 months in your bedroom but does this mean they should technically be with you till you go to bed.
My lo is three months old and still snoozes on the couch with me till I go up to bed. She sleeps in my room as did my firstborn ds.
Just contemplating starting a bedtime routing and putting her down at 7:30 ish as I did with ds. But we are pretty happy with her snuggling on the couch.
Is the advice to keep them with you at all times? Surely if they are on their own In a room even for a few hours it is just a high a risk of sids as if they were on their own all night.
Think I am looking for reasons to keep her with me as enjoying the cuddles with probably my last baby. I don't get to focus on her as much in the day as I did with ds as he takes my attention such a lot. Never thought much about it with him first time around . I was just following what everyone else seemed to be doing. I do want to get into good sleep habits mind.
Interested to hear others interpretation of the advice.

[ItsAllGoingToBeFine]

Yes. The advice is to keep them with you, so that they can hear your breathing, not the other way around.

[GrowAndRun]

We kept baby with us at all times when asleep (not ridiculously - ie would leave room they were in Moses basket in to go to loo, get a snack etc, but generally we were around them when sleeping) Started unto bed routine at about 6 months

[PennyHasNoSurname]

We didnt keep ours with us after 7pm once they got to about 8 weeks old. They didnt settle, got fractious and overtired. We have a ground floor flat with the bedroom off the lounge so we put them in there with the door open. We went to bed three or fours hours later.

Had they settled in the evenings in the lounge we would have kept them in there longer but they didnt.