PS5 slim questions

I actually considered that for the video but didn't get around to trying it (needs a stand). It should be totally fine - better in some ways for the top cooling as convection will occur more easily.

Hello.  The Slim PS5 build was very impressive.  I am planning to embark on the same project.  I have watched your vid probably 30 times and I have a lot of questions so please bare with me.    I have a sheet of stainless steel instead of copper for the cooling block.  Do you think it would be as efficient in colling the system?  Also, with your 2 water pumps, are both pushing coolant through the system simultaneously or is one effectively pushing into the system while the other pulls from the system?  Do they both run full time as long as the PS5 is turned on?  How long would they last?  Are there any specs for maintenance of them?  Do you have anyway to ensure that they are actually running?  Is there any type of fail safe for if they stop pumping for whatever reason?  Would you be available to talk ever?  I think your idea is brilliant...