I think the efficiency greatly depends on your switch efficiency and how many devices you are going to power vs the efficiency of your PoE injector or wall wart.
There is also a convenience factor of not needing to plug something in locally.
Also, security, someone can’t just unplug the power supply for your camera per se.
A switch will recognize a PoE device and push the full 15.4w by default. Then the device has the abi6to communicate back to the switch to specify how much power is actually needed.
Q: Is PoE energy efficient inside your home?
Is PoE more efficient than plugging in adapters for each network device?...
Here's a nextcloud docker compose for those who want nextcloud easy mode
services:...