BHK Preamp distance to Power Amp

Hey folks - qq
is there a prescribed distance between the BHK Pre to a Power Amp.
I have them on 2 seperate shelves, the power amp on the bottom shelf and the bhk on the top. Seperation between the 2 is about 20 inches seperated by a glass shelf, and herbies audio feet.

Any downsides with EMI/ RF interfering with the preamp signal path ?

I had my M700’s flanking my bhk pre at one time. Did not seem to effect the performance. They are now 2 meters away and still sounds the same to me.

good man @paul172 - thanks for sharing your exp.

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