In my opinion, DRLs should not be used. I prefer to have full head/tail lights on all the time I am driving. You can just leave the headlight switch always on and program the car to turn them off 30 or 45 or whatever, seconds, after turning off the car. You should be able to have them turn off right away after turning the car off, but mine (2013 SL) won't turn them off sooner than 30 or 45 seconds, I can't remember which. I try to program them to zero delay using LeafSpy, but it doesn't seem to work.
My concern about DRLs in general is that the front lights differ in brightness and shape and size with some being no more than parking lights. Full headlight low beams are safer because then are better at drawing attention to the car. None of the DRL implementations seem to have the tail lights on. In foggy and rainy weather, I can see and track the car in front of me better if the tail lights are always on too.
And also, people forget to turn their full headlights on when it gets dark, so you come upon a car with no tail lights, but the driver doesn't realize it.