To get around the uneven floor, you need to build a lip on the front. 2" by 3/4". This aligns everything nicely. Generally, the weight of the box is enough to keep it from moving around. If you want to be extra cautious, you can add feet to it and screw ir down.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>
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