What are you going to use it for ? That would help to decide if it needs to be one or two sockets. Switched is best as you can turn it off before pulling out the plug which will NOT be IP65 when you are holding it.
You will of course be installing the electric supply to the socket(s) properly and correctly in order to ensure ( as far as possible ) that use of any equipment fed from the socket will not create a risk of electrocution or other danger to people or property.
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