My basement floor has settled and slopes so it is uneven. The toliet drain pipe pvc flange is about 1 inch higher than the floor and also is not level (like the floor). My plan is to use concrete leveling cement to level the floor and then tile the floor. The flange will still be uneven but the floor and tile will be level. In your opinon, do you think the wax ring would be able to seal to toliet to the flange even if it is not level (maybe 1/2 inch from one side of the flange to the other?