If it were me I would have them next to each other or above below each other in the rack. Hell the closer they are then the shorter the IC run which means saving money :)
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I have used these exact units together, with the CD on the top shelf and pre just below. It worked perfectly. I don't think you should be concerned about any noise somehow being generated between the units. More important is ensuring there is adequate ventilation around and above the pre. I suggest at least 3" for each side and the top, and an open front and back. If you have less clearance, you should consider a small 12v fan. I run them at 6-9v to reduce the fan speed and thus the noise. Just find a cheap wall wart with the right voltage.
I'm sorry; I meant to say "electromagnetic" field. DACs are especially notorious for emitting a large electromagnetic field that interacts with other components that are nearby; the electromagnetic field usually proceeds more in a vertical manner rather than in a horizonical manner so it affects components that are either directly above or below the DAC. If you don't believe me try taking a transistor radio that is pulling in a strong station to within a few feet of a DAC or CD player and see what happens. I've heard the improvement in sound by moving DACs and CD players well away from other components.