The Xeon server would be a good bet. Your other machine would be potentially bottleneck for memory (though it meets min spec if the server isn’t doing anything else). There’s a NOAVX docker deployment available, would be slower but should work fine. Just be sure to disable anything associated with lyric detection, it’s an absolute performance nightmare.
I ran it on a Ryzen 5500u mini-PC with 32 GB RAM with the standard deployment with AVX2 support and scaled up to three worker threads. For a collection of 53k tracks it was processing about 100 per hour that way with lyrics/whisper translation enabled, but once I turned that off it was doing 1300-1400 tracks per hour.
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Edit - the 6600T would work too. I found with lyrics disabled, each worker only used between 500MB and 2 GB of RAM. Long as the server isn’t under load while scanning I think that would work, and would be faster for having AVX2 support.