setting toilet flange

[lamothe1]

I'm relocating my toilet about 18" in a slab floor (I've already jack hammered out the floor). my question is how high do I set the new ABS toilet flange and its the type that has a stainless slip ring with holes in it. are the holes supposed to be screwed to the floor? seeing mine is a slab floor can I position the flange exactly where I want it and drop the screws thru the holes then pore the concrete around it? that way I won't need to drill out the concrete to screw in the screws.

 

[Geofd]

the ring sits on the finished floor use stainless steel tap con screws to anchor your flange ring if its tile there is a tile bit that you use to go thru the tile...
so it doesn't crack then you concrete bit for the tap cons

 

[spidermanplumbing]

the ring sits on the finished floor use stainless steel tap con screws to anchor your flange ring if its tile there is a tile bit that you use to go thru the tile...
so it doesn't crack then you concrete bit for the tap cons

The flange is typically screwed to the subfloor