And yes I know Hitler survived attempts on his life prior to the war.
The most notable was in November 1939 at the BurgerBrauKeller on the anniversary of the Beer Hall Putsch where after giving a speech Hitler inexplicably left the hall barely fifteen minutes before the bomb, which had been planted in a column behind the speakers platform went off killing a number of SA men. Carpenter Georg Elser was charged with the crime and was executed in April 1845.
Probably not. As assassins, they were necessarily opportunistic. But as coup plotters, they needed more than mere opportunity, they needed a political rationale, which a ‘successful’ Hitler would have denied them.