I get under the bar and I squat.
When I had problems (years ago) I went to see a powerlifter (he happened to own the gym).
I did hip and knee exercise, corrected my form, got rid of the two by four under the heals and squatted.
Box squat, front squat, back squat, overhead squat, zercher, sissy, split squat, pistol, etc.....
Are irrelevant of your height. They are goal dependent only.
having said that, I have low back issues. I was always afraid of box squat, thought they would hurt my lower back. Found that they didn't and where actually quite good. Just get proper training. Start light, box at right height, get form first, then weight.
Good for strength.
Any powerlifting exercise is great for strength, even if you dont want to become a powerlifter.
One of the first video I saw years ago. Good intro.