you are absolutely right ... just don't go overboard. actually you just need a little boost and most important don't go blindly bump into one.
Those overhead pillar, road junction, THC, water tower ... are so easy to identify. 

again, most of all major self respecting developer have fung shui audit done already ... very rare can have very bad chi.

how far/near is the water tower ? BIG/small tower ?
usual take a photo from your shop lot. lets not play guessing game. 

more importantly your shop business not smooth meh ? if the tower really give problem, you move in 3 months already know. btw, commercial fung shui is reverse of residential fengshui, you want sha chi for commercial ... but just need to controlled it.