Pretty much any switch should do the job fine. It doesn’t even need to be a Gigabit one for the modest demands of audio streaming, and Naim streamers all use 100MB ports.
Personally I would have no hesitation buying a used switch that would otherwise be cluttering up someone’s loft. They are pretty reliable things with no moving parts, and there’s very little that can go wrong.
The Netgear Prosafe switches were a suggestion from Naim. That dated back to the time before aliens invaded the Streaming Aurio forum and turned it into a never-ending Ethernet cable and switch discussion. If you want to dip your toe in the water, get a Cisco Catalyst switch from ebay and see what you think.
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