Pixel Strip Bushing
thingiverse
I used spacer bushings to attach pixels to my metal roof. Magnetic hooks are a good option, available on Amazon at https://smile.amazon.com/.../ref=ppx_yo_dt_b_asin_title_o01_s00. I also recommend M4 button head bolts from Bolt Depot, found at https://www.boltdepot.com/Metric_socket_button_head. Fender washers are a good fit with these bolts and can be purchased on the same website at https://www.boltdepot.com/Product-Details.aspx?product=7313.
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