Usually in locations where hot climate is the every day issue this kinds of topics is always on the table,california is one of those place,i used to base my recommendations mostly because i've deal in the pass with it.
Now i wrote this because Head units & heat are very enemies,just as moisture & water.
Before i came to live in this country ( i'm from venezuela) i used to work this job & because the weather is mostly hot,hot & very hot i've seeing many dashboard customized with additional vents & air damns,etc. to help customers deal better with this issue regarding aftermarket music.
In the northern states hot weather is just for few months,so installing head unit in the lower slot like those in the VX shouldn't be a big deal,of course not.but in sourthern states such as florida & texas installing aftermarket head unit in lower slots can be a problem,specially as how i've state before if you play music for long periods of time.And this doesn't mean only the head unit,amplifiers falls into that group along with subs with high ohms at air -restricted areas.
But as how i've state before,all this is just recommendations,isn't the rule to have it done that way.
Now if you give a close up into the head unit user's manual there you can find info about head unit in high temperture areas playing for long periods of time.
ECU's often comes incased with high heat resistant shields,in my country they do,even more the cars builders that do business in my country actually "tropicalizes" their cars before they hit the the streets. But head units are more vulnerable to heat exposure so they fails much easier.
I can recall having two CPU fans attatched to my head unit & two additional vents at both sides on the lower dashboard where i used to live (98+ F all year around ) all because of the hot weather.
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