I’d say not by far the Atom, and not even the Nova is going to be able to drive those speakers properly.
Note that its 4 Ohms mean that in the most dynamic passages will fall frequently even up to the 2 Ohms, and there Naim does not feel comfortable.
My experience with the ProAC K6, also 4 Ohms nominal but even a better sensitivity than the Dynaudio, has been that neither the SN2 nor the SN3, both 80W in 8 Ohms, have been able to drive them satisfactorily, and in the end I ended up with a Musical Fidelity Nu-Vista 600, which is another story both for synergy with the boxes and by technical specifications, starting with the 200W at 8 Ohms and 400W in 4 Ohms.
In short, the Atom not by far, and the Nova, well, will work reasonably as long as the room is not too big, do not ask too much volume and/or do not ask for super dynamic compositions (EDM, symphony, reggae…).