Is there such a class of hardware in which you can install multiple HDDs set up as RAID, while the unit maintains their ventilation and power consumption, independently of a computer?
External HDD enclosures often contain poor plugs that can easily disconnect if moved, I mean a class that is designed to be part of your home or office (however it is would be desirable if it can be moved easily when needed, too). (I expect it also not be a dock though, as I think it won't protect the HDDs, accept multiple ones, do raid and manifest as a box for transportation.)
I mean such a kind that would prioritize USB connectivity over other kinds (say, ethernet), in order to be used as simple external drives (in contrast to servers), and because most desktops have only one ethernet socket. But unlike external closures, one meant to be placed like a tower or a box, with a fix placement and own legs.