1. They ALL specify that they should NOT be used in concealed locations
2. The actual opening in the supplies, along with the length you will need, will reduce the volume considerably which will increase the time it takes to fill the tub.
3. Any "jostling" of the tub will have greater consequences on the drain connection, that it will on the water supplies.
4. SECURE THE TUB IN PLACE. Do not "loose lay" it.