Munich is also considered a team that is good at turning things around. as they showed in the round of 16, they were behind in the first leg and reversed it in the second leg.
This situation could happen to Arsenal. and as you said, if Arteta wants to be safe, they have to be ahead by more than 1 goal. It will be quite difficult if Munich is in top form.
There is still preparation time, anything can happen, but I hope both teams are at their best when the game starts.
Being 1 or 2 goals behind is not a difficult thing to overcome and I don't see too much of what Bayern did in the round of 16 when they managed to win over Lazio in the second leg, I think it was appropriate.
Bayern has much stronger strength and mentality than Arsenal, so overall Bayern is slightly favored in this quarter-final regardless of what happens to the Bayern team in the domestic league.
There will of course be fierce competition because Arsenal is not a weak team, but we also have to make realistic predictions to place bets and for me Bayern will be able to win over Arsenal.