How many screws is needed to adequately attach at toilet flange to the floor? I am putting it on ceramic tile and didn't leave room on both sides of the flange to drive screws on both sides. I can get 2 screws on the right side. I just don't want to have to go buy a special drill bit and run the risk of cracking my tile by drilling on the left side. However, I don't want to fall over while I'm using my toilet either. Any suggestions would be appreciated....within reason. Thanks for your help.