I recently came across a post stating how to adjust side mirrors to avoid blind spots completely.
The C7 has blind spots and all but this is for people who just don't want to rely on modern systems.

Here is the link to article
https://www.caranddriver.com/feature...d-blind-spots/

For lazy folks, there is a video explaining the same
https://www.youtube.com/watch?v=QIkodlp8HMM