Hi
Without seeing what exactly you are doing it is hard to give you the best way, if you send us a picture, we will tell you exactly what to do.
From what you described. you have two choices. Use a hole saw to cut out where your pole will be on the tile> then take a jigsaw and cut a straight line back to the hole you cut ( this way you can spread apart to slide into place...) if your hole saw does not create a big enough hole, you can use the jigsaw to make it the exact size you like.
Again, call us and we can walk you through it.