Where the buckle should be

[Xabaras]

Back, Center (But I haven't see the belt loop and put the sporran simply on the waist)

[davedove]

Maybe i'm unique in that many times if wearing a strap instead of a chain with a sporran... I put the buckle centered underneath the sporan, so you dont see a buckle anywhere when you look at it, it's hidden.

I voted at the back, but I think this idea has some merit. As long as you don't have a long length of extra strap sticking out past the buckle, this should work fine.

Of course, the bottom line is to wear the belt how it works best for you.