Facebook ViewContent Event [!]

Hi,

I am optimizing Fb traffic for ViewContent Event with my pixel.

My funnel usually looks like that:

Facebook Ad ---> Landing Page ---> Product Page ---> ...

BUT sometimes I sent traffic directly to Product Page so then it looks like that:

Fb Ads ---> Product Page ---> ...

QUESTION:

Should I add ViewContent Event (pixel) for both LP and Product Page?

anybody?