Heat builds up really well in any sort of enclosure in the sun- like an oven. It would have to be in shade "24-7", even when the sun changes angles, for safety.
Our house is pretty much surrounded by a porchse. You can probably fit 12 worth of shade in it. It's like a side yard and backyards porsche. No way for sun to hit as sun only faces front of house. But still concerned... dang