It looks as though most of you are press packing placing the ID. Here is what I was doing. Typing the name out on pink paper, trimming it just outside the name for a border. Just before the final pack, I would lay it on the tissue side (intaglio) of the denture taking a thin strip of the same acrylic I am packing and place it over and did the final close. Pros, was not visible and did not disturb the characterization. Cons, if and when the denture needed a reline, you may lose it if you have to grind it out.
Now with injection, I cut a slot in the denture the length and width of the ID and repair it in using clear acrylic. I dont really think there is a right or wrong to this, just whatever you are comfortable doing.