The typical position seems to be that my elbows are just off the edge of the table/desk, my forearms just distal to my elbows rest on the edge of the table, and my wrists and hands are suspended slightly to be able to move freely to type. My forearms and wrists like to be straight, and I use keyboards without extending their rear legs so that they're as flat as possible. There's a slight angle between the table/floor and my forearms, sloping up from the edge of the table to a point just above the keyboard.