This really depends on what you are trying to achieve with the phone. I always have my phone plugged in while in the vehicle but I have not needed to look at it while driving. I always use android auto and my voice commands to make calls or navigate. For those reasons I have my Samsung S10 laying sideways in the open compartment under the screen(even this large phone or my son's S10+ plus fits). I use a very high quality 90 degree cable so as to not damage the wire. I keep the excess wire coiled up in that same compartment so that it does not get in the way of the shifter. Neither the phone or coil have ever slid out.
Yeah. I push mine back so it's shaded by the hood over the MFD. It's fine there normally, but if left there with the vehicle parked on a hot day with the sun shining in the windshield, it can get hot enough to shut down....I tried the suggestion of laying my phone on the ledge above the screen but gets overheated from the sun and a few times shut down...
I've used this vent mounted wireless charging holder for over a year with my iPhone Xr:
Ironically apple added magnets to their wireless charging in the new iPhone 12 series. It may lead to some neat accessories...just found this: Thus, magnets can cause interference with wireless charging, making it difficult for the two to pair together. This is why Apple suggests avoiding “magnetic mounts, magnetic cases, or other objects between your iPhone and the charger.”