raspberry pi raspberry pi 3b+ x 1 raspberry pi 4b x 2 poe hat https://www.amazon.co.jp/gp/product/B07JPXR9ZN/ref=ppx_yo_dt_b_asin_title_o04_s00 rack GeeekPi https://www.amazon.co.jp/gp/product/B07TJ15YL1/ref=ppx_yo_dt_b_asin_title_o05_s00 …