Meet the Ecobee SmartThermostat with Voice Control. It comes with a wall plate, but you can install it without.
It has a built-in Alexa speaker.
It also works with Google Assistant and Siri.
The Ecobee SmartThermostat with Voice Control costs $249.
It comes with a remote temperature and proximity sensor.
You also get a Power Extender Kit, or PEK, so you can power this thermostat even if you don't have a C-wire.