The problem is that German population was worn out from six years of grinding war, for continuous insurgency you need a fairly broad support base and they don't have that anymore, best they can hope is an uptick in attacks early on and then activity gradually dies down as their men are hunted down.
Where to Middle East will they go? In 1945 the ME was still controlled by colonial powers and even after their independence, while they liked to take nazi experts, they wouldn't like the kind of nazis that would bring too much negative attention to them and after WWII any kind of nazi government in exile will get a lot of negative attention. Regimes that wold be willing to support international terrorism were not yet in power.
Not to mention that many of of ME nations were courting Soviet support and Soviets would not be thrilled about the said nations supporting nazi terrorists in their slice of Germany.
I reckon the best chance for some kind of resistance springing up in Germany (but not right after war) is implementation of Morgenthau plan as it would result in resentful population and large diaspora supporting them and it would likely result in several competing resistance groups as many would blame nazis for bringing the woe upon them, while others would take the stance that nazis were right afterall. Once the cold war heats up, KGB would support leftist resistance groups in West Germany, while CIA would support rightist resistance groups in East Germany.
