Do you mean like a curve in the stairs, then you have 2 stairs before the curves when you go up??
Do you have a wall to one side of the stairs and something like a wooden beam/banister/wall at the other side?
If so then there was stairgates i got from mothercare for mine like that. Really cheap, a bit fiddly to install but once in they are secure.
Will go see if i can find the link
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