PCB Design of an UHF RFID Reader

Hello, I need help putting together the PCB design of a reader I'd like to build. The Board will need to be able to be powered both using an external power supply and POE. A microcontroller similar to the Raspberry Pi 3 is preferable. The UHF reader module is already designed, and I have the design files for it as well. The idea is to connect this the microcontroller to the readermodule.