The problem with the windshield wiper mount is that if it leaks, it's leaking in your engine bay and could be a safety hazard (ie flames).
The problem with the trunk mount is that if it leaks, it can leak into your car cabin and be hazardous for your health as methanol is a chemical you don't want to inhale.
Of course, it can not leak either.
There's tradeoffs either way, but my personal opinion is to not mess with methanol at all unless you're really pushing for every hp your engine can make.
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