I don’t know either but one would hope that Naim Unitis and smaller Focals work together. However, as always it depends on ears and room. @airedog had the 816 Chora floorstanders with the Atom and liked it. (Personally, I didn’t like the Kanta 3 and Sopra 3, but it’s a different thing)
I haven’t heard the Lumina 2 but recently many forum members have taken a liking to Sonus Faber with Naim, me included,
and others in this thread (and other threads if you search for Sonus Faber)
I did get an astounding deal on my Focal 816 towers, but they sound great to me. I added the Isoacoustic Gaia III which improved them also. The were great with the Atom also. I’m sure the 806 bookshelves would be worth a listen.
Another cheap tweak is to buy squash balls, cut them in half and put them under your speakers. Very cheap experiment and you can buy them in different colours.
No experience with the Shawline X, but if you ask me it is quite similar to the Rumour with an extra braid of protection … I’ve used the Rumour for quite some time, very nice cable which I can really recommend!
I have the Shawline X with the Nova feeding a pair of Dali Rubicon 6 and can’t fault them, the high frequencies can be quite harsh occasionally but I blame the recording and the ribbon tweeter.