As always, the manufacturer's installation instrutions rule the road.
I was at first intimidated by the 64 page manual but fortunately only 20 pages are in English!
I did not see any requirement to balance the water lines, but that may be related to the fact that this thing seems to cycle the sprays for the massage action. Didn't really study whether you can have multiple sprays continuously on, but the installation did not seem to require anything special.
I did note this requirement which I assume you have considered:
A dedicated water heater, 80 gallon (302.8 L) or larger, is recommended for this installation.