We hired a capsule so as not to interrupt sleep. Makes no difference, because as soon as you shut the car door she wakes up. And has only fallen asleep in it twice in her 9 weeks of life anyway.
We made all the noise in the world in her first three weeks, but it did nothing, and now for some sleeps we have to tiptoe or deal with a very cranky little lady.

i have worked in childcare and as a night nanny. I've seen hundreds of different strategies and employed everything I know to create the best sleep habits I can. And I still have a shocking sleeper.

So I wouldn't worry about it. Hire a capsule if you're unsure, and make the decision later. That's what we did.