Just say Palo Alto Networks ...what does Silicon Valley has to do with one company?
Similar to "Florida man"
"Silicon Valley Man found doing insider trading with buddies."
"Silicon Valley Man is pumping the blood of the youth through his veins."
What's Silicon Valley's excuse?
Using a location before the words "man" or "woman" implies that the man or woman is from that location.
When I say "Chicago woman makes thirty pizzas for homeless shelters", you wouldn't ask about the relevance of the word 'Chicago' because it adds to your understanding of the woman.