our windshield is slanted so much that the proper angle on the cf-100 is pulled all the way back till it stops. yes, it shows some of the dashboard that way, but it's still wide-angle enough to see traffic lights that we have to lean forward in the seat to see. and it does get plenty hot here in houston. our cars are NOT garaged, but there is a small tree to one side of the driveway, so my wife's car gets partial shade for part of the day when she's home. maybe the heat is actually good for this camera? maybe it makes the mount ball expand and get tighter or something.
the blacksys ch-100b i have in my truck (cf-100 is in wife's car) has a MUCH more solid mount, and much more discrete form factor, but the front video quality isn't as good as the cf-100. but it has a big emergency button, and it has wifi to make downloading clips and changing camera settings simple via smartphone app. the rear cam is also more solidly mounted, though i had to get creative about mounting it in my truck since the center of my back window slides to one side to open.
there's also the k1s, but it's battery-based, and has horrible audio... but it's 1080p front AND back, and has a remote DVR box so there isn't anything bulky on the windows - just some tiny cameras. and it has a remote lock button. but i wouldn't want to use a battery-based camera for parking mode, especially with how hot it gets here in houston. i haven't used one of these but it's gotten decent reviews here and there.