Ergonomics for tenor can extend beyond the finger and hand positions. Many players also look at the angle of the mouthpiece and the position of the horn. In this situation the neck shape has plenty to do with it. Here are two pics that show some varying neck angles.
This one bends right after the body, pushes the horn further away and has a curve up at the neck opening.
http://www.clarinetperfection.com/work/tsselmers2-0107/neckOleg.jpg
This neck has a higher arch, and brings the horn closer to the body (is shorter due to the arch).
http://www.clarinetperfection.com/work/tsselmers2-0107/neckVII.jpg
of course, there are other variations too.
This one bends right after the body, pushes the horn further away and has a curve up at the neck opening.
http://www.clarinetperfection.com/work/tsselmers2-0107/neckOleg.jpg
This neck has a higher arch, and brings the horn closer to the body (is shorter due to the arch).
http://www.clarinetperfection.com/work/tsselmers2-0107/neckVII.jpg
of course, there are other variations too.