It's more about electrical load then the number of items. Technically, that would be 2 X13A sockets so 26A But I think most double sockets are rated to 20A total. So long as it's not kettles, heater, toasters etc, it should be fine with things like printers, TV's, etc, they are probably quite small wattages. I have two 8 way extensions hanging off two sockets behind my desk, all populated and they both have 5A fuses fitted and are fine.
Just tot up your wattages.