Depends how much braking you want. Adjacent magnets N, S (attracting) give more braking than N,N or S,S (repelling). If there is an empty space between magnets this reduced the difference between the two setups.
If you are going to glue them, and I would as I have had one come loose on a cast and it scored the spool and made one hell of a racket, be sure of the number you want and the location of the magnets. You can always add more but taking one out if it is over breaked will be a pain to do.
Good Luck