I'm not sure I understand what you're suggesting, but I think you want to align the bottom of the new tile you're placing with the bottom of the initial tile. I don't think that's allowed. The rule book says:
- You must place the new Park Area orthogonally adjacent to another Park Area in your
park, so that their edges fully align to one another.
I assume the "constructible" areas of each tile (the 4 by 4 grids) must align with each other. At least that's how I always payed.
But the rule quoted here clearly prohibits the placement you are mentioning. That seems sufficient.