Having worked for NASCAR, IMS and IRL Timing and Scoring, several major tracks subsidized by NASCAR were told that the scoring building would be located in Turn Four (NHIS, Lowes, and Dover are configured this way). This was done way before electronic timing & scoring was perfected.

That being said, if one wants to spend mega bucks for a system that will detect multiple lines around the track( SCCA systems typically only read one line), then you could generate a serial list of cars passing over the S/F line (if one was installed there), independent of the scoring line which would still need to be located in a place where the scoring personnel could see the cars passing.
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This, of course, assumes that one is allowed to use said "NASCAR" timing loops. Many tracks prohibit any access to either the timing loops or any electronics connected to them.

And, the S/F timing loop is not at S/F! It is the distance before the line that NASCAR mandates that the Transponder is from the front of the car.

BTW: The "timing" building at NHIS is used as a meeting room by NASCAR. Timing is done from one of the rooms way up on top of the grand stands.