good timing for your post as I haven't been on here in months. to be honest, i didnt secure the bottom part. didnt need to. nothing was mounted to it (like an amp) and never made a noise. when i had it, i thought about possibly drilling holes in the floor and securing it that way, OR to somehow reuse the seat fastners. never got around to it as someone broke into my car and stole all my crap 2 years ago haha.