The only problem I foresee with hot-melt glue, besides them falling off, is that if you do get them to stick (Or use 2-part epoxy or some other uber-strong glue)...If they ever fail then it would be really hard to replace.
Velcro looks like your best bet for removability, but my team just uses 2 screws diagonally across from each other on the 884's.
Hope this helped!

Michael, Team 341