With better PSUs you will get better sound quaility.
For example more detail, more refinement, wider soundstage, better control of bass, sweeter highs, better separation, clearer presentation, lower noise floor.
Naim systems have PSU hierarchies and suitability of power supplies for their products.
With the new classic series they have simplified this with one main PSU the 300NPX.
So with the Supercap DR it has a larger transformer than the HiCap and has more power rails. It will provide more refinement, greater detail, improve separation.
I had 82 and had Hicap then 2 Hicaps, then went Supercap 2. Each upgrade was an improvement, although the 282 and 82 cannot make use of all the power rails.
For original classic and Olive gear there are many different power supplies.
For preamps: HiCap, Supercap
For sources: XPS and 555PS
There is also the Flatcap that can be used on some preamps and some sources. The HiCap can also be used on some sources.
There are also different versions such as version 2 and DR.
The 500 series preamp and power amp comes with it’s own separate power supply. As does the 300 power amp.
Naim separates power supplies so that the sensitive signal stages are kept separate from the large transformers and power lines.
With racking of equipment it is advisable to keep power supplies separate from sources and preamps for best sound quality.
I have had most power supplies including HiCaps, Supercap 2, XPS and XPS2, 555PSDR and then the power supplies that come with the 500DR and 552DR.
Likewise with the Linn LP12 they use power supplies to improve sound quality from Majik, Lingo 4 to Radikal 2.
So with your system you could add an additional HiCap DR to your 282 or go Supercap 2 or DR. The benefits other than an improved sound quality would it makes way for a 252.
With your source an XPS2, XPSDR or 555PS or 555PSDR added to your NDac would take things to a very high level for a 3 box streamer.