I need advice in assembling cluster power supply for 20 Raspberry pi 4. I need an MCU power enable  for each Raspberry pi 4. The total current requirement is 3A*20 = 60A,  power requirement = 300W (+ losses) => 400W.

<li value=”1″>PSU: Adjustable Voltage DC Power Supply, DROK AC 110V-220V to DC Output 0-24V, LED Digital Display 12V 24V 20A 480W Switching Power Supply Regulated Converter Step Down Transformer Built in Cooling Fan: https://www.amazon.com/DROK-110V-220V-Converter-Adjustable-Transformer/dp/B08GFSVHLS/ref=sr_1_3?dchild=1&m=AFHAE9RJVUMB&marketplaceID=ATVPDKIKX0DER&qid=1618076331&redirect=true&s=merchant-items&sr=1-3&th=1
1. Regulator: 5v Regulator, DROK 5pcs Mini Voltage Reducer DC 4.5-24V 12V 24V Step Down to 5V Buck Converter Board 3A Volt Step-Down Transformer Power Supply Module: https://www.amazon.com/gp/product/B0758ZTS61/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1