I want to know what distance you recommend from the edge of the bathtub to the faucet location?

Sorry we don't have that information, and there is no special request on distance to the edge of the bathtub. It may also depends on the bathroom constructure and the bathtub location. As long as you can fix the faucet and make the waterfall spout enough to reach the tub, and you can get the handheld easily when using the tub, then it is the correct distance.