InDel is a common concept in molecular biology, while the representation for InDels are non-unique. There are at least two representations: left-alignment and right-alignment. Actually, it does not really matter, but it good to have a convention. I would like to suggest using left-alignment for these reasons:
Standard Statistical genetics center of the university of Michigan denotes that left-alignment is necessary.
The standard convention is to place an indel at the left-most position possible. —GATK
Since left-normalization is gaining more and more popularity, my suggestion is to just use left-normalization, and that database curators as well as users both use this practice, so that we can compare apples to apples. —ANNOVAR
In the end, I would prefer to stick to the convention — left-alignment.