If your discounting speakers for their obvious and sometimes massive differences in placement, anything with moving parts benefits from from a solid base. For instance, the less error correction a cdp has to perform the better it sounds.
Only other consideration I can think of is heat and allowing components that get hot the room to dissapate that heat. Other than that I wouldn't care too much where they are placed. Becomes more about aesthetics than anything else imo.
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Current system:
RPi + Allo Digione
Beresford Caiman Seg & Dorado powered by 15v Linear PSU
Transcendent Sound Mini Beast OTL
Amptastic Mini-1
Klipsch KG4.5 Speakers with Titanium Diagphrams and Sonicap Cap upgrade
110aH Leisure Battery powers the Mini-1 & Digione