Question regarding proxy

Hi guys hope everyones well.
So i have a question for you guys.
I know the instagram app allows you to use 5 accounts.
If i post something and within seconds use those 5 accounts to like that specific post in the app,
only those 5, can something go wrong?
Or since instagram allows 5 accounts is that alright and safe.
Or do i still need a proxy per account even though the app allows 5

You don't need a proxy for this. Especially in the app you're perfectly safe with this

You definitely do not need a proxy to do manual work.

even if i use all 5 accounts to like one new post in seconds?

Yes with 5 accounts on your phone and some likes you're safe