do you have Surge protection and or a UPS?
if not I would recommend it heavily for out site cameras on poles
the generator coming on has fried several of my PoE injectors and midspans. best fix every time was a $200 UPS. even if their is any problem that could harm the midspans, injectors, or cameras, the UPS will sacrifice itself before letting any surge destroy stuff down the line and that is a $200 cost (rare as most have reset buttons for things like that) which is way cheaper than an of the AXIS name brand Premium equipment you would have to replace.
In line cat5 and cat6 surge protectors would be the next Item I would invest in. anywhere from $10-$100 a piece they can save your cameras I use them any where I have Direct burial Cat5/6 in the ground that's not in conduit.
Fiber would be a good way to go for future installs if you can terminate fiber or have someone do it on the cheap for you.
But this sounds like a job for a UPS and some surge protectors.