'Piece of mind' in mains cable for me comes from using good-quality industry-standard cables, say Volex or similar. You can find shieled ones too, for not a lot of money.
If they use a standard 'kettle plug' connector be aware this format is only rated for 6A regardless of what aftermarket parts claim. There is a dispensation under the regs for short cables <2m (or is it 1.5, cant remember) using the IEC plug to be rated 10A. Far more than enough, both long term and instantaneous peak draw.
Honestly, beyond good solid, tight fitting and reliable connectors there's not much to it (and some of the tweakier takes on mains cables are ....shocking in terms of build quality)