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.
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