What's the proper way to fit a hybrid/commuter bike?

Most detailed bike fit articles seem to apply to road bikes but not so much for hybrid/commuter bikes which cycle commuters, recreational cyclists, and weekend warriors often use. A good bike fit can encourage cycling for transportation, improve fitness and health, and shorten trip times because it increases comfort, reduces injuries, improves power output, and reduces the risk of neglected muscle groups while exercising.

From what I learned, posture actually affects which muscle groups are emphasized. It's about as important as learning how to pedal properly. Using more of our muscle groups can increase endurance and power. It may even improve blood pressure responses during exercise which is especially important for those with a heart condition. A study showed that exercising with our arms led to higher BP than exercising our legs. Arms have smaller muscle groups than legs. They should have fewer capillaries too so the heart has to work harder at the same blood flow. Rolling our hips forward increases glute utilization. With a good bike fit, it's easier to pedal smoothly.

For hybrid bike fitting, can we determine the saddle height by the 30 degree knee angle, heel on pedal with the knee straight, or 109% method?

Would the knee over pedal spindle method be reasonable?

How do you know that the stem length and angle is correct? Road bike fitting often have the back angle at 45 degrees, and the shoulder angle at 90 degree but what should they be for a hybrid bike fit?

Since hybrid/commuter bikes don't have drop bars, should a mountain bike fit be used instead?