Our designs always use physical brackets. Our Phantom subwoofer for the F22/F87 has been stalled for a while, but as it stands the conceptual design intent was to utilize the two factory mounting holes that you can see below. You may be able to replicate something similar. Should be pretty easy on the F22/F87, most of our Phantom subs end up quite a bit more complicated (F30/F80 and F36 shown at the end).
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