Extraction->P2 planets are notorious for being troublesome when balancing both the required extraction rates. Extractors themselves require vast amounts of powergrid to the point I would honestly advise against using more than one per planet.
Efficient Extraction->P1 setups can be built with CCU-IV, so you only need one (maybe two) characters with CCU-V for an efficient factory planet setup to crack all the P1s your other PI alts are producing.
In fairness, I have heard of some folk making a hybrid extraction->P1 setup that takes another imported P1 and cracks that with the locally produced P1 to make a P2. I haven’t made such a setup personally.
You’ll also need to factor your tax rates in, so flex that spreadsheet-fu and compare the profitability of producing P4s over selling the P2 or P3 components.
FYI: here’s my basic setups from when I was making Nanite Paste from scratch: Meph's Magical PI Setups for the Interminably Lazy
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