Not sure that the newer 4Runner interior is anything like my truck, but here's where I installed mine. Just, just enough space that I don't hit my knee on it. If I had longer legs it would probably be a problem.
My biggest issue with this thing is that it's always on. No problem in the day, but at night the
light from it is pretty annoying. But I seem to be really sensitive to
light once it's dark out.