resulting in a very compact PoE solution that plugs straight into the PoE header on the Raspberry Pi 3 board, with the buck converter outputs going into the ground and +5V pins on the Raspberry Pi ...

That means there are a lot of options to choose from, but unless you have a very specific need in mind, there’s one name you ...

pins, and power source connector. Also read: Single Board Computer: Raspberry Pi vs Beagalebone vs Arduino.