I could see the Allies insisting on unconditional surrender, but I also could see the Allies offering some sort of minimal guarantees for the German population in general as to what kind of life they could expect afterward and what would be expected of them to make things right and what kinds of people would be facing justice for war crimes. The reward for the Allies in making such statements is the lives and treasure saved, occupations ended earlier, POWs returned earlier and the people dying every day in concentration camps saved, and it doesn't cost them much.
Everyone knows Germany is beat by July 20th 1944, I could see German military leadership surrendering with some sort of very minimal guarantees. They don't have much choice.
If the Allies insist on stated unconditional surrender, and harsh ideas are floated about what Germany's future is, I can see continued resistance but it would be very hard.
Germany is going to face almost immediate defection of its remaining Allies, is military Junta Germany going to crush things like the Polish uprising or Slovak uprising, or flip the Hungarian government when it tries to change sides. I bet even Croatia will try to get out. Mussolini will probably flee to Spain in an aircraft quickly before it ends. What will the military Junta do with the concentration camps, would it stop the killings and start feeding everybody decent rations, including all the Russian POWs and with what. Honestly a military Junta leadership can get it hands dirty really quickly if it continues to resist and won't want to do that.
Germany is done within a month regardless.
Good news for Poland, I can see the Home army uprising working, air fields seized and the parachute brigade + the exile government being flow in. Maybe they have a shot in avoiding communism.
Maybe the same kind of thing can happen in Prague.