I found this which may help you in general terms of mains cables. Note the reference to the Chord Dave and mains cables.
https://audiobacon.net/2019/08/17/27-audiophile-power-cables-reviewed/
For me the review seems to test only US mains cables without a fuse ? Correct me if I am wrong.
The Atacarma mains cable has a matching fuse which is matched for the cable so for us in the UK we also have the variable of a fuse to contend with. IMHO fuses change the sound of the cable so in the UK the review may not apply unless you use a non UK plug...or change a UK plug internals to negate the use of a fuse...!
As far as the value vs for SQ only you can answer that question there just are too many variables for us to discuss on the Dave forum
I have tried the Chord Sarum T, Music, Signature, MCRU no 77 with Orange fuse, Jorma (Circa £1,200) and Supra with Dave.
NOTE the fuses make a difference YMMV.
NOTE When I use a Torus Power Supply the cables have a lesser affect.
BTW I love the Atacarma Racks and they made bespoke base (special order) for my Torus power supply see enclosed.
The beauty of the company and rack is they will change and bespoke the rack to meet your needs in the present and future.
You can change the height of the legs the product is awesome. PM me if your purchasing the SE as I want to upgrade to the new SE2