In fed rules it’s the nearest hash. I have posted the only times A can designate the spot:
ART. 6 ... Before the ready-for-play, A may designate the spot from which the ball is put in play anywhere between the hash marks:
a. For a try.
b. For a kickoff.
c. Following a safety.
d. Following a fair catch.
e. Following an awarded fair catch.
f. Following a touchback.
g. For the start of each series using an overtime procedure.
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