I don’t like my phone obstructing anything at all: vents, screens, gauges, buttons, nothing... Which took some searching, but this location with my iOttie (Amazon) has been working out well and the only minor downside is you have to be careful opening your door if the phone is plugged in, but my cord has enough slack.
Best iPhone mount I've found over the years is just "high temp" VELCRO... You just need an iPhone case that has a rigid back for the Velcro... You want the 3M "high temp" version of velcro (or whatever 3M calls it) for the dash. It does not soften, smear, or move in the summer temps on your dash (or wherever you mount it), yet it can be removed without any problems or damage to the dash material (a little cleaning with goo-gone might be needed). I've done this with 3 leased cars so far. Works great.
Photos: iPhone with standard soft piece of velcro on back, 3M high temp velcro on dash, phone attached..