I am a culprit (my phono stage is resting on top of my preamp even as I type), but the best advice is unquestionably don't stack any audio gear. With tubes I suspect this is doubly true.
Heat is a big enemy of electronic components. Especially true w/tubes that run hot to begin with. Also low level signal in phono stage very susceptible to alteration by mag fields and RFI from the line stage.
I have a Janus. In the manual it says that there has to be a minimum of 3 inches of space above the unit. My unit gets a nice warm operating temperature even with this much clearance so I think it is not possible/advisable.
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