The Ceptics Worldwide Travel Adapter Set is a safe and compact travel adapter that fits all 2 and 3 pole devices from and to more than 150 countries worldwide.
Even the receptacles are universal (Worldwide support) and are tight enough so plugs do not fall out of them, but not overly tithe either so you can still pull your plugs out with ease. 110V or 220V it does not matter, they are designed to handle both. This model has grounding built-in so you don’t have to worry.
I would avoid those all-in-one travel adapters simply because they are bulky, clumsy and always block neighboring sockets, a major problem especially if you are at the airport or in a conference room with many people, but limited power sockets.