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With regard to mounting location, the block is by far the best choice. You can try other locations and determine their suitability by trial and error, but the block is virtually guaranteed to work. The problem is that every part of the engine has its own natural frequency. Blocks and heads are obviously very stiff. Brackets and sheet metal not so much. When excited by engine operation, the knock sensor with pick up that vibration and could misinterpret it as knock. So there is that.
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