The connecting cables poke through into the top of the enclosure and almost hold it in place, but I added a tie-wrap for security.
The passive POE splitter is quite an inexpensive one. The only issue perhaps is that the A3 gets rather warm running on 24 volts.
I guess it will help keep the snow off in the winter …
Yes, it would be nice if the A3 had a switching power supply instead of just a 3-terminal regulator.
I checked today and the voltage actually appearing at the unit is about 21 volts – so well within the spec.