I need to install shower caddy type rack in shower that has ceramic tile. The racks came with screws and plastic anchors that look like they are for drywall installation. I need to know if these anchors can be used? I fear they might expand too much and crack the tile.(wife not happy at all). Can i just use the screws in the tile? I need some help on this cause as all you guys know i cannot screw this on up. Thanks in advance.