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Here are the MR46E environmental specs from the data sheet. No customers I have worked with have had a problem in a temperature controlled warehouse.Operating temperature: 32 °F to 122 °F (0 °C to 50 °C) Humidity: 5 to 95% non-condensing
Another post provided a handy antenna chart for Meraki branded antennas that you might find helpful:https://community.meraki.com/t5/Wireless-LAN/Meraki-Supported-Antenna-Chart/m-p/128264If ceiling height is especially tall, using omni-directional ant...
If you separate the APs between two different networks you could have one network with the SSID hidden and the other network set to broadcast the name. As HodyCrouch mentioned, there is always the SSID availability feature that can simply remove the...