Odd they’re on the list and so unknowledgeable in general about finger installs. After having that kind of experience and conversation I don’t think I’d want that particular installer anywhere near me with a scalpel !
30 degrees from vertical if hand placed flat on a table is the same position I have mine, and it doesn’t get in the way of any smacking, gripping, everyday use of hand. Probably more convenient and hidden than flat and strictly in the middle part of the tip
Worth the effort to make the trip, if all goes well it’s a one time thing 
And yeah the titan is tall, I’d say its a little bit taller than the Haworth I currently have