Emile, I've just had a fascinating trial of the eficacy of HRS Damping Plates on top of my gear. It occurs to me that Daizas on top of components would perhaps replicate or improve upon HRS effects.
I mean, if Daizas act as a sink for noise from gear down into them, surely they would work w noise also going up into them. Esp if the Daizas are heavy enough to properly mass load/direct couple to top plates of components.
Emile, I am seriously impressed w the HRS Damping Plates (I think Artesania make something similar too). I'm wondering if yr Daizas on top of gear are an avenue for me to investigate, maybe even do an HRS v Daiza trial?
I would probably do this on my cdp, since a regular sized platform is all that would be needed.
If I went down this path, my pre amp and psu would need 1/3 width platforms since ventilation slats are on the top plate.
10 cm wide would not make that much sense, the bare minimum would be around 12 cm wide with a somewhat more considerable length, otherwise it would be lacking "mass". Do note you would still use the footers, even when placed on top, so it should not significantly impair airflow.
I have not looked at HRS plates, I have sold quite a few Daizas to HRS rack owners though. It just does work different then any other products I'm aware of. Hence you can combine / replace at will.