If I am understanding what your question is correctly, you can certainly do that. If you do that however, you are only "looking" at the power that is coming in from the commercial post. The slightly more complicated installation can be set to "look at" both the commercial post voltage/amperage output plus your generator output.
Gary and Dee, Zowie and Bowie (traveling cat sibs)
2019 Cornerstone 45B, X15-605hp, Imperial, Spartan K3,
2013 Honda CR-V toad, Demco Excali-Bar II,
Demco Baseplate, Demco Toad Light system, 73 de W5FI