This design requires very flexible water supply lines from below.  They need to be able to shift vertically by about 6”.  Also, the water lines are very flimsy.  They kinked very easily when trying to attach them because they couldn’t swivel very well.  Luckily the pex NPT fitting was able to twist as well.  Make sure the fittings in the floor can spin.  Overall it is a sturdy faucet, I just wish they’d spend an extra 20 on decent water lines and fittings.  One more important thing, I’m feeding with 34” stepped down to 12” at the last foot and the supply pressure is 65psi.  This produces a maximum flow rate of 5gpm, which is lower than they say, but still ok for my needs.  Remember self standing tubs are usually around 70 gallons to the overflow, so that’ll take about 15 minute.