Six of the ER doctors who treated JFK were interviewed the day of the assassination and then two days later by a Texas medical publication - the Texas State Journal of Medicine. This is, as far as I know, the earliest accounts they gave about the location of the head wound (excluding the press conference).
Here is, summarizing things, what they said about the location:
Perry: "...a large wound of the right posterior cranium was noted..."
Baxter: "...portions of the right temporal and occipital bones were missing..."
McClelland: "..massive head and brain injury from a gunshot wound of the right side of the head."
Bashour: no description given
Clark: The wound was in the "occipital region of the skull" and there was "a large wound beginning in the right occiput extending into the parietal region."
Jenkins: "There was a great laceration on the right side of the head (temporal and occipital)..."
So we have the location on the right side of the head, the right and back side of the head, and the posterior side of the head.
Question: Which account is correct?
Answer: Let's have an autopsy.
Link to interviews:
https://texashistory.unt.edu/ark:/67531/metapth599863/m1/104/?q=McClelland