I just used a roll of 3M #3614 Heavy duty for some vent visors on my crosstrek. Ridiculously strong tape, and I have no doubt it would hold a speaker in place. How long is the question. weather, along with constant vigorous vibration may not be too kind to it.
Use screws/ bolts like everyone else. Don't try to reinvent the wheel.
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P99rs Head Unit--- Amps- 2 Pioneer Prs800d --- Zapco ST1000MX---Zapco ST-4XSQ---- SI BM mk5 Subs---SI TM65v2 Midbass--- SI M3 mids--- SI M25 xbl2 tweeters ----- 2016 MECA street class 3rd place at world finals
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