Depends if your keeping the total back, and most importantly the shoulders back, in a absolute straight line. If even a slight rounding of the shoulders, than the main focus of the exercise is lost and more stress is put on the small of the back (to be avoided at all ). With weights, usually just about a 90 degree range is done.
Keeping the chest out/lifted and the head back also helps with the proper performance of RD's. The back should be as flat as you can make it and the feet about shoulder width apart. Remembering to keep the standing weight on the heels and not on the toes, when using heavier weight. All of the above will target the ham's quite well. Can use either a BB or DB for these.
A good warmup would be to put the toes on a 2X4/BB plate/whatever and work towards a good stretch. Suggest using the bar only for this style warmup. With a non weight warmup: clasp the hands behind the back, with toes on a 2X4, etc, and hold the bottom position for a few seconds, working for that stretch. These non weight movement can been done throughout the day to improve any tightness, or reduced ROM, of the hams and Hips/glutes. These raised toes stretches seem also to have an affect on the calves, reducing tightness and overall improvement of shape and size.
Some find that RD's give a good stretch to the lats, even adding a bit of size. Don't see too many guy's doing lat stretches (of any kind) anymore, but were quite popular back in the day for bring out a sweep. Either two or one handed stretches were used. If wanting to try with RD's, might suggest a wider grip than the normal shoulder width grip.
Good Luck
