Does your Poprad have have rack mounts in the dropouts and on the chainstays?
If not, the third one is your better bet. If so, one of the other two, preferably the second.
No, I have to attach it to the same mount point as the fender mounts. I think that may be why my current rack is a little short. No for the chainstays as well, but I also do not have a bridge with a brake mount, so I would need to adjust the third option as well.
Here is a pic of the mount location:
http://www.flickr.com/photos/joshger...7606428044910/
That's not mine, but it is exactly the same. I think I might need the third option as well.