OP is using a moulded plug, nothing can drop into this one, doesn't account for others though.With only one item plugged into the adaptor there is no real problem, and TV etc use very little power.
DO NOT FIT SOCKET UPSIDE DOWN although there is nothing wrong fitting sockets upside down, it also means the plug is upside down, and the cable entry ends up on the top, so anything dropped can go into the plug, so sockets should not be fitted upside down.