Plenty of people run Harrops stealth system.... there's also plenty of OEM setups that blend the blower in to the engine by use of covers.
Loads of hidden turbo setups, so why should a blower be any different?
My experience is this... don't attract attention by driving like a douche, don't run a toothed belt setup and you won't have any problems. You don't need to hide it in the engine bay if you don't get pulled over to begin with!