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Listening to the audiobook "D-day through German eyes", I thought: what if Germany had surrendered before any Soviet force entered its territory? A German soldier in the book says that his motivation after 1943 was to protect his motherland from communist enslavement, so I thought that maybe, from this standpoint, it would have been better to concentrate resistance on the eastern border and let Western forces invade deeper.

Was there any predetermined arrangement, official or non-official, to divide its territory into sectors in the case of Western powers occupying the whole of the country before the Soviets managed to enter it?

Would the Soviet sector have covered less ground than it did in actual history? Or it would have been the same, and there was no benefit from letting Western forces advance deeper?

P.S. My question is not about whether were was any possibility of a conditional surrender, or of surrender to only some of the Allies. I'm curious whether it was possible to escape communist rule by re-distributing the resistance effort to the East.

The boundaries of the occupation zones had been settled at the Yalta Conference between Churchill, Roosevelt and Stalin. A basic plan for the zones had been made during 1944, by the European Advisory Commission, but it was modified at Yalta. The Yalta conference presumably announced that there would be occupation zones, but I doubt that their boundaries were published at the time.

In early July 1945, the troops of the various occupying powers moved to the agreed areas; before then, each part of Germany was occupied by whoever had got there first, and some US troops withdrew 200 miles to let the Soviets take over their assigned areas.

This agreement, and the compliance with it by the Allied forces, meant that letting the Western Allies advance further would not have made any difference. The areas that were agreed to be Soviet-controlled would have inevitably ended up that way, unless the Germans managed to repel the invasions.

The requirement of unconditional surrender was decided by the Western Allies in January 1943 in Casablanca. Even earlier all Allies promised not to conclude
a separate peace.

There was no arrangement and no accepted plan of what to do with Germany before the beginning of 1944.
In the early 1944, when it became clear that Germany will be defeated soon,
there was a discussion what to do with Germany when it is defeated.
Various plans were discussed by the Allies.
See, for example https://en.wikipedia.org/wiki/Morgenthau_Plan#Morgenthau's_memorandum.

According to Wikipedia,

The Morgenthau Plan was seized upon by the Nazi German government, and used as part of propaganda efforts in the final months of the war which aimed to convince Germans to fight on.