Standard Practice For Surge Protectors?

This question is in two parts:

Part 1:

We have been involved in several projects where we have installed camera systems using long runs of underground network cable to poles up to 1000 feet away from the power source using in line poe extenders. We came out of the ground with a unistrut and junction box to make these connections in each case. The entire system has around 40 poles with around 100 cameras. We only deployed a total of 5 of these extenders for the entire project, and they are spread out over different sections of the property. Long story short, when there is a severe lightning storm, these extenders, all 5 fail. All the cameras we used have built in surge protectors, all the devices on the poles are grounded to the electrical ground. The only place we do not have a ground are these 5 junction boxes spread out through the project. My question is, how would you recommend to protect these extenders. We are considering adding one ground rod, 8 feet in the ground for each of these junction boxes, then adding 2 poe surge protectors (one on each side of the poe extenders, in the same junction box) which will each be grounded to the ground rod. Two questions:

1 - Would you consider this a viable solution?

2 - Should we be concerned with the additional resistance from these surge protectors since we are pushing the limits of POE so far? 

Part 2:

1 - When deploying cameras outdoors on 10 ft tall aluminum poles, is it standard practice to install a surge protector near each camera even if the cameras already have built in sure protectors? 

2 - Where the cables enter the building, is it sufficient to have a network rackmount surge protector for all the pole mounted cameras or should the surge protection be deployed before the cable enters the building? 

Thanks in advance for taking the time to read this and hopefully provide your point of views.  

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