With regard to the Raspberry PoE HAT on either a 3 or a 4:
1) Any way to connect a Pi to a live PoE Switch without the board booting?
2) After shutting down a PoE Pi, any way to start it up again without disconnecting and then reconnecting the Ethernet cable?
The Quattro boards I use have a power jumper for each Pi to allow them to be controlled individually without impacting the others on the same board. The Netgear GS308PP I am testing is unmanaged so I don't see any immediate way to remotely control PoE at a port level.