@Julie660 I'm absolute fan of home automation - in my private home. Echo dots in every room, smart lighting, smart heating, etc.
But I would only consider adding smart home tools to my rentals that are very easy to handle and/or give me control about my rental when I'm not there. The more technic you add the more has to be explained and the more can fail.
Keep in mind when adding Alexa devices. They always need a working internet connection and they usually are connected to your Amazon account, especially if you share your own home.
If the Alexa devices run on your account make sure that there are set some limitiations, so that people would not be able to place orders on Amazon, not be able call or send messages to your contacts.
And what about guests who see the presence of Alexa devices as violating their privacy. the consequence would to be to announce your smart home automation on your listing before booking to get guests allowance. And if the guests don't agree, you'd have to safely disable the devices.