Get someone to do a predictive design based on your requirements (types of devices, high density areas, applications in use, roaming paths etc). Anyone that tells you just add X number of devices is only interested in selling you tin and not actually trying to get it working as you need. id go for the CW9164 AP as it’ll give you most bang for your buck though. No need for the 9166 unless you need directional APs.
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