Mosaic shower tray with porcelain floor tiles - Tile Advice

[Rick-o]

Good day all,
Just looking for a bit of advice really. I have a wet shower tray to tile.. The tiles to the outside it are 12mm porcelain, the mosaics going on the wet tray are 8mm. Does anyone know of any simple way to bring the mosaics flush with the porcelain tile that wont mess with the falls in the tray. I was thinking of using the appropriate size notch trowel to spread then flushing that out once its gone off, would this be an option in your opinion?
Thanks
Rick

 

[Mark Frost]

lift the wet tray up 4mm