I've always found that the holes closest to the bend are hard to get screws in, and later remove them.

I'd be forced yourself all four holes on the short leg, simply because there are only four, so why not use them.

On the long leg, I'd use the two holes at the very tip, and then also use the two holes that are "almost" next to the bend.

If for some reason I felt I needed to add a screw right next to the bend, I'd use a very long extension on the driving bit.