You'll probably be ok with your bowl.
The medium/large dog people who are in classes with us classes with use bowls and platforms similar in size to yours, or even larger. Mine are small, just because my dogs are small. My guys are convinced that anything much larger is either a sitting or standing platform!
Try it! In your vid you had your toes to the bowl so she couldn't get into heel completely and is why she was touching the front of your leg. If the bowl is at your side then she can stand on it next to you in heel.