I stand to be corrected, but with the exception of the premium cabin and exit rows, which zone you’re in depends more on who you are and how much you paid for your ticket than where the seat is. If you want to be sure, pay for an exit row - that will get you aboard either in Zone 1 or ahead of Zone 1. Otherwise, being near the back of the economy cabin is a good bet. But then … you’ll be near the back of the economy cabin … ugh!