Unity 2D tile based building simulation(Building problems)

I'm in trouble with placing Objects(Prefab). The problem is when i place the object on tile 3x3 sized Object was ok but 2x2 sized Object Placed weird. 2x2 sized Object and 3x3 sized Object works same with the building position. I've changed Sprites pivot to Topleft but it doesn't worked. Pls help me

In the above image it shows the GreenHouse which size is 2x2 placed in 3x3 tiles. I want to place the 2x2 size objects in 2x2 tiles!

I'll show my BuildingManager Script which builds Objects just in case.