i am considering mounting mine only with heavy professional grade velcro so i can get it out if i need the space. i have a 3 series convertible so space already at a premium.
enjoy, sounds like you have a 3 series and have played with the locations, assuming left (drivers) side in the back corner is your favorite. have you experimented with having the basslink horizontal, vertical, in other spots, etc.? an installer told me not to have it under the package shelf that the bass would be better in the front so it is not surrounded??? not sure what to make of that but i havent decided on a final spot for it yet. thanks!