I was actually someone critical of these tracking devices before someone trust one in my hands and said "go try it out". Took it home and never disconnected it.
The difference to the hat switch is massive. Not only will the Track IR device scan the exact point where you point your head at, but it will do so very fast. If you have the possibility, go try it out someplace, you'll see what I mean within the first 10 minutes of flying.
The only side effect it may have is a stiff neck after some gruelling sessions
And a 24 inch monitor will do nicely, no multi setup needed. Actually, Track IR does to a large extent away with the requirement for one.