You should tie surge ground to your electric service entrance ground. Two separate unbonded ground points will cause potential difference during a lighting strike and damage your equipment.
I disagree when the rods are separated by 20 to 50 feet and the new rod is tied only to the surge protector for the camera.
If ground rods are not bonded together there will a potential difference when lightning is directed through one of them.
Not so. I'm not going to sink a rod for a surge protector near an outdoor IP camera then run a wire 20 or 50 feet to bond that ground rod to my house's electrical system ground rod. That 20 to 50 foot conductor would guarantee a possible potential difference and therefore increase the likelihood of current travel!
The Earth has impedance and as the current travels through the dirt to the second rod there will be voltage difference between them.
It's because of the HIGH impedance due to the separate ground rods being 20 to 50 feet apart that lightning has NO reason to travel from one rod to the other rod if grounded to earth properly at the point of ESD arrest by the surge protection.
This voltage will travel through your equipment and damage it.
Again...not so, IMO.
I'm talking about arresting induced static /ESD from
nearby, high-energy lightning strikes which occur in greater numbers and with greater frequency; I hold little hope in preventing damage from a
direct hit from lightning.
In summary: We agree to disagree.