After thinking, it will be preferable to remove the 1V8 and 2V8 from the bottom PCB. They are used by the RPi CM, and there is risk if IME perturbations.
The alternative is that the PCB BOTTOM provides only filtered 3V3 and 5V0. The DC/DC 1V8 and 2V5 converters will be placed directly in the TOP PCB.
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