The Gosund Smart plug does not need a hub of any kind to work and are suitable for standard Type B sockets. If you have a mobile phone and are able to download the Smart Life app then you will be able to use this smart plug. In order to use the smart plug, you will need to have access to a 2.4 GHz wifi secure network.
If you are struggling to connect the app to the smart plug, ensure that your wifi router is set up to 2.4 GHz frequency. Some routers are dual band routers which allow you to connect to both 2.4 GHz and 5.0 GHz frequencies simultaneously. Most wifi routers nowadays offer both. If you are unable to change this in your wifi router yourself, I recommend contacting your internet provider who should be able to offer some advice.
Please note that the Gosund smart plug is not for large household appliances such as microwaves, cookers and air conditioners. An appliances power should not exceed 10A, 1100w.