On the Internet everyone is an expert, and if you ask 10 more people, you'll get 10 more opinions.
Pre-impeller liquid is potentially dangerous:
1. in large doses
2. at low pump pressure
In other words, using a 10 psi windshield washer pump with a 3/32" jet is asking for trouble.
A 100 psi pump and a 1/32" jet avoids most of the danger with introducing a fine spray that does not have large droplets smacking the blades and causing local erosion and temperature changes.
Not to step on your foot, but questions like "why then do most superchargers have the carbs mounted on top?" indicate to me that you have a way to go before understanding what's happening will allow you to make your own decisions. Right now, good advice is the best plan.
They're on top because they won't fit anywhere else - sounds silly, but there are no successful SCOT, GMC, Weiand, B&M, etc. manifolds to do this, too big, too heavy, makes the drive much longer.
