I would be concerned. The instructions for your exact model will be available on the internet. My Triton shower instructions say it must be at least 1m up from the tray but I think that's just for UK water backflow regulations so might not apply to you. The instructions also say "Position the unit where it will NOT be in direct contact with water from the showerhead" which suggests it might only be splashproof. Inside the unit between the front and back cover there are plastic lips etc which look like they are designed to divert water away from the internal components, but that's probably only good for splashes, not constant spray. Mine is a 240V 10.5kW shower so must pull 44A, it's on a 45A breaker. I wouldn't want to risk making my body any part of that circuit.