Low Performance campaign split — CPC & product allocation

I'm about to set up a low performance Shopping campaign alongside my PMax feed-only campaign. A few things I'd like clarity on:

For the low performance campaign, what CPC settings are recommended, and how should I think about that?

My current thinking for the split: products or SKUs that have enough volume but a ROAS that's just too low to stay profitable go into the low performance campaign, products that barely convert or don't convert at all get excluded entirely, and new products I just test in the main PMax campaign.

Am I thinking about this in the right direction, and how do the campaigns handle this split internally?

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Low Performance campaign split — CPC & product allocation