Nazi Missile Development?

The Nazis had plans for submarine-launched missiles even during the war OTL, so you can bet they would probably the first to get SBLMs in this scenario, so you wouldn't necessarily need land silos anyway.
You most certainly would! SLBMs took until the eighties to reach ICBM range (5500km+). Previous SLBM were rather IRBM or even MRBM for the early sixties. Also, SLBM were substantially less accurate, being launched from a moving platform which has to find out it's own position first). Another thing is throw-weight ICBM can carry more and heavier warheads until the miniaturisation of the seventies and eighties.
 
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