Sliver of pixels appearing between adjacent objects sharing vert coordinates (tiles)

Not sure how to fix this issue.

I am using a free asset for in editor tile mapping called "2Dtile" from a group called "lemoDev". The asset outputs each tile as a separate mesh object. Each mesh will have discrete unity coords like (0,0,0) (1,0,0) (1,1,0) (0,1,0), so when they are adjacent, they will be sharing exact vert coords with their neighbors.

All is right with the world with this approach, except that when the camera is in motion, and when it sits at certain places, you can catch a sliver of pixels between the adjacent mesh objects. The effects gets worse the further zoomed out the ortho camera is, or the smaller the display resolution. Anyone know how this can be solved? It is a huge problem I need to fix before I go any further in development.

You can try it here to get the issue for yourself:

https://www.dropbox.com/s/6cwcteedaccssdh/2dPrototJan10th.1.7z?dl=0

Thanks in advance!