Starglow
Getting comfortable
As it relates to Ethernet SPD’s there are countless companies that offer the same. Some reputable companies such as Citel / Ditek.
Keep in mind a solid low resistance Earth ground must be present. Everything must be connected to that single point ground to reduce a voltage differential.
This is also a good time to have a grounding bar installed and located so everything can be easily connected.
I think this is way overkill for the average home with only a few cameras installed since these are not commercial or medical building environments. For most people the risk of lightning strike or surge is very low to warrant such a high cost financial investment.