Daisy chain SPI operation are usually specified in the datasheet. The MAX31865 doesn’t mention any details about daisy chaining. Communicating to multiple devices of the MAX31865 will require separate /CS for each device.
MAX31865
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The MAX31865 is an easy-to-use resistance-to-digital converter optimized for platinum resistance temperature detectors (RTDs). An external resistor sets...
Datasheet
MAX31865 on Analog.com
Daisy chain SPI operation are usually specified in the datasheet. The MAX31865 doesn’t mention any details about daisy chaining. Communicating to multiple devices of the MAX31865 will require separate /CS for each device.