Spike-busters and power strips usually sport their set number of sockets regardless the shape of the plugs to be used. Unless you go in for the expensive Belkin ones, “extension cords” here in India are standard and sport limited sockets. Something like the Slot-Type Power Outlet will be handy for us and the world over. The idea is not to have “holes” or set number of “sockets”, but just a swipe-in slot to hook up the plugs. This ways different shaped plugs reside comfortably next to each other plus accommodate more than the regular strips.
Slots for 3-pin and 2-pin plugs are different though, but easy to manage.