Problems with location anchor

Hi all. I'm quite new to Aero. I have been practicing for a week now, but I keep running into three problems that I cannot solve. Both are related to location anchoring.
As a way of 'learning by doing' I am trying to 'land' this model of an WWII aeroplane onto the entrance drive to my home. I added the location manually into the coordinates on the right side of the Aero screen. And I sat the 'snapped to the ground' check mark. (see attach) But:
1. the plane (encircled) is way off the right location (arrow). And when I move the view with my mouse the plane changes place. So it seems not really anchored. However...
2. when I scan the QR code generated., I DO see the plane in front of my house. But it moves with my own movements. So I cannot really walk around it. The object keeps 'following' me, even to 10m or more from the original anchor point. In other words, it is again not really anchored to a location.
3. The plane is floating several feet from the ground. I tried correcting this by adding a minus y position by trial and error.  But that does not really seem to work. Could 'snapped to the ground' option maybe overrule this?

Is it me doing something wrong? Or is it the betas status of Aero? I am using the (by invitation only) Beta version 0.23.4 (#127). Thanks in advance for any help.