This is the only flaw I could see in your relatively well thought out plan; Leaving a phone permanently plugged in over a long period of time would cause the lithium ion battery to expand, which isn't a particularly good thing to do. Especially if you also consider how hot NZ garages get in summer (depending on where you live of course) this in itself can help speed up the process for a potentially nasty battery rupture.
High risk to take being near or close to dem investments
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