When I first did this, the false floor didn't quite fit flush. This was due to the plastic piece that goes over the latch area causing the spare to sit up slightly higher than normal; on models with included spares, there is a cutout on this piece that is not there on the eGolf.
However, the corners did still snap into place, with a slight hump in the middle. And as the plastic of this trim piece slowly molded itself around the tire, the tire sat more flush to the floor and the false floor has become flatter.