I went with this one and am happy so far. I let the pad sit on the dash for 2 days (40 degree highs), parking it in the sun a couple of times for a few hours. I then assembled the rest. One or two days later it fell off the pad. LOL But then I mounted it again (apparently correctly this time) and it's been on for 2-3 weeks now with no issues, about 3,000 miles (road trip to NC mountains!). I wish the arm would extend just a bit more in order to clear the cowl over the gauges. When I turn the adapter into "landscape" mode, I have the charging cable sticking out the bottom which ends up being on the right side. The charging cable then runs over the edge of the left side of the display pane. It's really not an issue - and certainly none at all if you keep the phone in "portrait" mode with the charging cable at the bottom.
While it may not be 100% perfect, I think it's the best option for now and am happy that it's a one-hand-on/one-hand-off mount that positions well and is closer to my touch than the nav screen.