If you have a newer intel-based PC, you might not even need the Coral. Frigate added support for Intel's OpenVINO. They're also adding support for the RK3588's rockchip npu, but it's still newer so I wouldn't recommend unless you like tinkering.
For PoE, I'd just do whatever is convenient. I've done setups with 2 PoE switches before so I could just run one cable between the front/back and then branch out from there.
For PoE, I'd just do whatever is convenient. I've done setups with 2 PoE switches before so I could just run one cable between the front/back and then branch out from there.