I do not understand your block and i don't understand what is your problem:
i don't see any path for water inside your block, just two flat blocks with dimples, touching, and no way for water between those half tubes.
you can mount your blocks using:
--an elastic piece of steel that goes over over the block and that could even fit in a shallow slot to make it even with block surface and to position block centered with procesor core and use tabs as usual (one, two or three as you see fit)
--holes, bolts and spring coils using only an extension of the lower half of block to save vertical space or using holes that keep all this inside the hole.
You can even braze a thin piece of copper below the lower part of your your block; the key would be using a strong enough brazing and have the surface of this added copper as low as posible.
--just holes and bolts, somewhat risky, but you need less space and can can use the same procedures from above
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