How to Get Tiles to Adhere Perfectly to the Grid

So, I’ve turned on the Show Grid option to start building with blocks, but I can’t actually get them to snap to the grid. I have the Snap to Grid option turned on too but it always seems to snap to the middle of four grid squares. I have my grid the size I want it, so I don’t want to change it. I also have my collision tiles the same size as the grid squares, but how to I make them fit exactly into the grid squares. I got one to fit in using coordinates, but I couldn’t get a second one to snap onto the side of it.

Set the point of origin (imagepoints) in the sprite editor to the upper left corner (press 7 on the num-pad).

Set the point of origin (imagepoints) in the sprite editor to the upper left corner (press 7 on the num-pad).

I tried changing the image points on my tiles, but there was no observable change as far as I could tell. Do I have to change the image points on the grid? If so, how to I access that, as I can't open up my grid in the editor.