I found that I could keep the turn signals in the stock location, no problem at all with the Trax cases nor the Givi cases that I now have. I like it that way as 95% I'm not using the panniers, and even though they are kinda hidden, they are perfectly viewable for traffic behind you.
The EVO quick lock adapters are nice, but I HATED the Trax panniers and topcase, they scratch and dent if you stare at them for too long. Dropped one of the panniers from over the other, they were stacked, just knocked one and it fell lock first, the lock dented and got the whole thing out of square. It was impossible to get it square again but I got it to close... And the lock, FFS, you can break the rivets with a small screwdriver... not that I did, one of the rivets that is also the pivot for the lock came lose, and was lost, from my topcase's lock and the stupid thing opened itself. Ended up selling them for 1/3rd of what I paid, but I don't regret getting rid of them.