Installing tile on a floor around a toilet flange can be one way to ensure that you have a neat installation. If you use the right installation procedures you can then place the toilet on the tile without cracking the tile. But you'll need to know what these procedures are.
To prevent your tile from cracking from the toilet weight, be sure your floor surface on which the tile is laid is level. Remove any debris that could prevent your tile from lying flat. When you tighten the screws holding the toilet to the floor, be sure you don't over-tighten them.