Surge protection will not help as it will only protect "stuff" that comes in on the AC power line.
Burying the cable will not really help either ..I used to work for an audiovisual company that sold to really rich people like Tiger Woods etc.. We got back a lot of units that had obvious lightning damage.. it would blow the top off, or blacken, IC chips.. In almost every case the units were installed in a secondary location, like pool house, boat house, or guest house and connected to the main house by low voltage cables.. The cables were installed both underground, as well as in the air, and it did not seem to matter one way or the other..
I used to brag that I did not use no stinking wireless link..
It worked great.... right up to the point where my neighbor took a direct lighting strike and I got what was left over.. It was pretty obvious that in came in on my hard-wire between the EasyTouch and my house network.. It took out the main board in the EasyTouch, and then the Protocol adapter, the u Verse Modem, and the router and everything that router had plugged into it. I now run the wireless link.. I knew the risk from working at the Audiovisual company, but did it anyway.. Sigh!!
If the same thing happens again, (knock on wood) I would expect the outdoor antenna and maybe the main board would be taken out again..
But, at least all the stuff in the house would not be involved..
It is your system and you can obviously do what floats your boat, but my boat hit the rocks and sank, so I won't be using the hard-wire solution again.
Edit.. I just saw the surge protection that you link to... That was the "fix" for the problem that the audiovisual company was going to use, but I never did get any info on how successful it was.
Thanks,
Jim R.