Yup, they are the text book stretches for Glutes and hips.
But try this...
Grab yourself a hand towel. Twist it up to make a rope.
Sit on your bed and loop the towel round one foot. With both hands, pull the towel, keep the leg straight and get your head as close to your belly as possible.
You will feel the stretch all the way down the back of your leg and through the facias in the sole of your foot.
If you feel anything in your lumbar region or even up to your thoracic region, you needed the stretch.
Repeat with other leg.
The nerve you are stretching is from the Brain stem to your big toe, spreading into two at your pelvic girdle.
Stretching each muscle individually DOES NOT stretch the nerve along all its distance.