I can confirm that, however my phone has also survived in a holder at the wind screen because even though I have a holder with various mounting options not everything works in every car (don’t have an own one).
About the metal heat sink ideas: Keep in mind that such measures can also affect all kind of reception of the phone. If e.g. the GPS is disturbed this may not be exactly helpful while using the phone as navigation device (especially because the phone doesn’t use Glonass etc. since Android 7 anymore, only GPS).
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