I use a weird wing shape that gives some extra coverage to my left shoulder. Think a coffin shield with an extra triangle bit on the top left side. I do a pretty passive shield style so it works well for me.
In the days of yore (1.3) I had a half heart kinda shape to my shield:
It’s just under what used to be the maximum area, 35.5” from the bottom tip to the top of the curve, back when we had such things and walked uphill both ways in the snow* to get to the circle.
With 2.0, and the removal of shield size limits, I did this, and yes, that is a long sword.
I don't like strapped shields in general for Alliance, because they're harder to get out of when you get disarmed, are packet magnets, and we don't hit hard enough to need the extra mass in a shield to help soak impacts.