A smart plug is all you need. I use Kasa HS105’s and Amazon smart plugs. For Kasa you have to use the Kasa cell phone app to set them up then they can be managed with Alexa. For amazon plugs you just use Alexa to set them up and manage them. Amazon plugs only work with Alexa.
Since most people already have an Amazon account, Alexa comes along for free.
So the question is if you only want to use a laptop via a browser to setup and manage your device will Alexa do both using a laptop with WiFi and Bluetooth.