Question about adding products into the pmax

For a fashion store, after how many conversions do you recommend that a product should have (or how much spend) before it should be added into the pmax

I feel i've been adding products into the scaling pmax campaign too early - some products begin to perform worse - maybe due to weak data signals after I add them into the pmax scaling

Are you able to put a physical number on it if you had to - or maybe a minimum number for number of purchases or amount spent

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Question about adding products into the pmax