I have not heard Naim gear with Zu speakers but I see no reason that they wouldn't sound very good. I do have experience with Zu speakers and a variety of amps.
I have a pair of OMEN MK.II with upgrades that I purchased directly from Zu Audio. I've listened to them using the various amps or integrated amps I have (both tube and SS). The speakers sound good regardless of the amp I use. My amplifiers are as follows in no special order: Plinius SA Reference Allnic T-1500 Conrad Johnson Classic Sixty SE Luxman 590 AXII Class D Audio SDS
Naim and Zu should be a good match. I have not heard them together explicitly but wold be shocked if they don't work well together. Naim gear tends to be warm and Zu performs well with warm amps.
I have run Zu Essences with multiple Art Audio Amps and Marantz and found warmer sound profile of the those amps to be a good match.
I have a pair of Omen Defs and every amp I have thrown at it sounds really good. Even an old Pioneer Elite Receiver that I had used for a bit in between purchases. The only thing I would caution with high sensitivity speakers (like the Zu's) is super high output amps paired with the preamps. Tube hiss will be much more of a factor. Even the newer McIntosh "hybrid" integrated may have a bit too much gain for the Zu's
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