hansgrohe rough in for tub filler, how to set???

Chris Fox

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The rough in for my hansgrohe tub filler fianlly arrived. I need to mount this rough in into a slab so the tub filler can fit on top of it and the tiled floor.

My problem is, how to set this rough in w/o pouring backfil concrete over it. The hot/cold lines enter in at the bottom and are threaded. I dont like the idea of concrete over connections especially threaded. I plan to use PEX. If I dont reinforce wit hconcrete back fill the tile around the tub filler is not supported.
A couple of ideas are: Backfill a recessed pocket to bolt the rough in to. Then bolt a steel plate higher up to floor surface to support the tile. I could level out seams with thinset etc.
Just dont know if this is a bad idea or good idea.

Anyone mount a hansgrohe rough in for a tub filler on slab, how do you do it.
Attached is a detailed view of the setup.
BTW. The idea of mounting on a box dosent appease the wife, its gotta look like the pics in the fancy home magazines:D

Thanks Chris
 

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