1,780 Joules is what it states in the link posted previously. ...
I have had 0 further problems in a period of about four years, give or take.
So, I conclude that I am getting protected.
Typically destructive surges exist maybe once every seven years. "about four years"? How do you know a surge even existed? Assuming based in hearsay does not make a valid recommendation. Meanwhile, that cyberpower number say it does not do effective protection.
First, 1780 joules typically means it uses only 590 joules and never more than 1190 joules. Numbers that claim near zero protection. Just enough above zero so that advertising can claim 100% protection.
Second, existence of MOVs obviously does not mean protection. As defined repeatedly, no protector does protection. Some protection systems don't even have a protector. But protection systems always require earthing. cyberpower does not have and will not even discuss earthing.
Third, where do spec numbers discuss protection from each or any type of surge? It doesn't. It claims no protection. It does not even list each type of surge. Protection exists only in advertising and hearsay.
Fourth, hundreds of thousands of joules. Where does cyberpower even discuss a typically destructive surge? Will energy just magically disappear?
Hard facts and science for the Op’s questions included 'less than 10 feet' to single point earth ground, where energy must dissipate (what actually does protection), how to kludge a solution, responsible manufacturers who provide effective protectors, and what is done everyplace when surge damage cannot happen. A cyberpower product contradicts or violates every number, well proven science, and numbers.
1780 joules is even near zero surge protection. Where do hundreds of thousands of joules dissipate? How do parts inside a cyberpowre stop what even three miles of sky could not? More damning questions that say cyberpower provides ineffective protection.
Relevant are facts and numbers combined with engineer's experiences and 100 years of well proven science. Facts that say a cyberpower does not do what the OP has requested.
For everyone: No earth ground means no effective protection. A protector is only as effective as its earth ground - which the cyberpower does not have and will not discuss.