Resistors can limit the diode current to less than the absolute maximum rating of 10 mA. For such small currents, the power rating does not matter.
When you are not using the amplifier, Vcm does not matter. But the current into +V S will (partially) power…
The following table helps select th e right multiplexer and switch with Mid Voltage 25V =< VSIGNAL =< 99V in different configurations:
Precision , Protection , Automotive , Extended Temperature
Configuration
16:1
MUX36S16
MUX506
…