Walbort

A few months back, we had a bad lightning storm at one of our locations, and a lightning strike fried a few switches and some other equipment.

I was looking at something like this, but I'm curious if I would need two devices (it's sold as a kit of 2) on each end of the run as suggested, if I'm only really interested in protecting the LAN equipment upstream.

For double the cost, I want to know how much extra protection I'm getting by putting the second lightning protector next to the outdoor device, instead of only next to the switch.

Edit: Formatting

We have a site using a Z1 and USB cellular as its only internet connection. The network has a yellow dot and a permanent alerting status. Is there any way to set it so the Z1 sees the cellular circuit as primary or intended to be active, or otherwise clear the alerting status?

https://i.redd.it/t9r0snsinvf11.png