Rocker Alignment Question

[snapper911]

Hey guys,
Install new rockers on a 71 911 and I wanted to confirm something I can barely see in most photos. Is there supposed to be a slight drop from the red line (in the below photo) to the notch where the rocker threshold sits against? Essentially, does the yellow area in the pic supposed to have a slightly downward angle? or is supposed to be completely flat along with the rest of the rocker?

Hopefully this make sense!
Thanks for the help!