Depends on the FH style (and yeah it's rare for the front shoulder to be low.) It should feel "natural", so if it doesn't, then it's not a good match.
Most people who are doing the WW FH (sit and lift, arm extending into ball, lots of forearm rotation, etc.) should swing with a higher left/front shoulder. Which is most people.
If your FH uses a fairly closed stance or a very high takeback, or if it resembles the swing style of a WTA player, then you may be the exception. Then it'll help to use a lower front shoulder. Also, you can look at how you hold the racquet in the takeback.
In general, when you're shadow swinging, if you notice that your elbow starts to hook up in the finish, it means that there's a hitch in your mechanics. Some pros play with that characteristic in their stroke, but I feel if you're just learning the WW FH, it's good to use that as a barometer of where you're at.
But, yeah, if you're doing the electric slide, you gotta dip your left shoulder, then your right, and work that fro. Ain't nuthing too it, put your back into it!