That's maybe the only downside to the upgraded interior on the 2019 Foresters with the addition of all the "soft touch" materials. It makes mounting things to it more problematic. It's sure looks good though!I'm just lurking here, but I have some input to your question (waiting for my 2019 to arrive). I've used the iotte suction cup type of mount for years in my 06 Acura TL. If its mounted on hard plastic it'll be fine, BUT if it's on a softer part of the dash it WILL deform the surface. Honestly I tried it for a couple of days, took the mount off, saw the marks and mounted it from the windshield. In my case the dash went back to original. I don't know what would happen if you left it on for months or years.