Different companies have adopted different design philosophies with regard to behavior after a power outage.
If the appliances draw 15 A or less, you can just use a GE or Linear pocket socket, as they will be typically off after power outage. ( of course, always verify that any specific device you purchase works in the way you expect, as you never know when a company might decide to change something. )
If the appliances draw more than 15 A, you have fewer choices and I believe they will all have to be direct wired. So before we get into those, do you need something for more than 15 A?