I'm looking to get a HomePod Mini for Christmas. Is it recommended to get more than 1 for a home? Looking mainly to use the HOME app to control things like my thermostat, lights, and other smart home items. I don't have an item that I leave at home 100% of the time to be a "hub", so I think the HomePod would be used to do that correct? Do these ever go on sale for Black Friday?