HomeKit compatible switchable sockets usually come with only one slot. Satechi now offers a dual outlet.
This is particularly practical in the kitchen, for example, if you want to connect two appliances at the same time to the individual socket because you are tired of constantly having to plug them in and want to make them switchable directly via HomeKit.
Practically both outputs can be switched separately by Siri, that means you can start the coffee machine in the morning and add the toaster later. The price is around sixty dollars*, which is still reasonable.