I would run the pvc pipes along the inside of the wall maybe at ceiling height, be sure you consider the drain also, you do not want a low spot.
Let me add if you end up with a "trap" aka a low spot in the drain line this poses a health risk as I understand it, be very careful if you need to run this line any length.
Also, in our house these lines are larger 3/4 or 1" lines, not sure if I have seen PEX in this size. Next you will need to consider the connection of PEX to PVC (no idea on this) and you absolutely need to make sure you have the correct tools to make the crimp connections on the PEX lines.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
Last edited by villagetinker; 01-20-2025 at 10:17 PM.
Reason: Added additional thoughts
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