Your comments

Thanks for the explanation. The idea of the large hidden plane sounds good, avoiding the extra step via the toolbar. A plane can also be adjusted easily, when not aiming for Y=0. Thanks.

Yes, snapping would be great!

Peek works fine, when placing assets on existing ones. Would be cool, when placing assets into the void, that they would be placed on zero regarding the Y postion. So, this should apply even if (the considered) snapping is off.