Mounting a sub box?

[maylar 10+ year member]

What's the accepted method of mounting a sub box in the trunk?

I'm making a custom box about 17 X 16 X 8 and it'll sit on the floor of my trunk, off to one side, up close to the inside of the fender. Do you just screw some metal 'L' brackets to it and bolt it down? Or use a rubber pad under it, and maybe foam rubber between the back side and the car body? I don't want it to come loose or rattle against the body (that'd make "outie" dents!).

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[mycarbumps]

i think you should add some foam or sumpthing, when it comes to subs you can never prevent to many rattles.