I don’t really think that a devastated Germany by 1945 has any capacity to launch any sort of Nazi guerrilla movement - there’s hardly anyone left to fight it that either is committed enough to fight it and hasn’t already been killed or captured. There’s hardly a social base for it either, the Nazis had run out their goodwill among the German people at this point and I can’t see this being successful by any margin.Hitler ordered guerilla warfare to be used, I would see this war taking in up to early 1950s in best case scenario
At best, this movement ends up like a smaller version of the Spanish Republican Maquis that descended from the hills and mountains of rural Spain to fire some shots at local police and civil guard or to rob a few banks and burn a few buildings here and there. Certainly not a going to be a movement so successful that it is long lasting and takes any sort of toll on the occupying Allies. The only thing this guerrilla movement could do is revere a wiped out leadership, watch their former idols publicly try and deflect blame for their actions, and actively make Germany’s new position in the post-war world worse.