If you want a rack mounted server purely for aesthetics, I’d suggest buying just the case and filling it with the internals of a nuc (or whatever you have available) yourself.
That way you’ll have full control of power requirements & noise from the unit, something that rack mount servers usually seem to suffer from.
Someone here gutted his fibaro server. The concept is the same - you just need to find a case that you like & a used nuc for the internal parts.