Designed to mount two Raspberrys with POE HAT on top of each other in the side of a 19" rack.
The 2.5mm spacers belong under each POE HAT - the 4mm spacers on the other side of the lower Raspberry Pi.
You will need 2x M3 press-in nuts, 2x M3x20 countersunk screws, 4 M2.5 x 15mm spacers and a few M2.5 allen screws of different lengths.
Used POE HAT
You had to print: 1x Sidemount, 1x Basemount, 4x 2,5mm Spacer & 2x 4mm Spacer
The author remixed this model.
The bracket was narrowed to fit better and to mount two Raspberrys with POE HAT on top of each other.