Great question — answering as the UphillTech team:
I would advise sourcing a single NEC Class 1 (>100W) power supply, and mounting it in a location with adequate ventilation. You want a power supply with <1000VA protection so that your DC wiring is "Power Limited" per NEC Article 725 Class 1. This DC wiring can share conduit with mains wiring. Run all of your controllers from this single supply. It may be possible to use many Class 2 (<100W) power supplies, to avoid the need to set up a supply in a new location, but such an approach is not space efficient. Fitting two <100W Class 2 supplies into one box is technically compliant, but against the spirit of the rule, and may cause overheating and premature failure. Does code allow for in-wall...
Full answer by Tim Vrakas: https://diy.stackexchange.com/a/332141 (CC BY-SA 4.0).
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