one question, is your home alone for, lets say 1 or 2 month or maybe longer ?
In this case, a single PoE injector is better, cause when only one part has a failure, the other cams are still working.
The disadvantage, the red ans are loving the power sockets, the lifetime of the cams outside is really limited,
avoid high temperatures, a cam under an old true satellite dish will have a longer lifetime, than a cam under the sun.
If you have 5 cams, buy 10 cams and configurate them,
that every cam has its ready to use spare part.
Its all about life - work balance, so place the cams on "easy to reach" positions, where the replacement is not a dangerous act.
The outsite power lines should have an RCBo, but if you leave the house for a longer period, you should bridge the RCBO,
cause in case, if its activated, all your outdoor cams are dead.
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