Vucchini4pcs 300ml 11oz Gravity Olive Oil & Vinegar Dispenser Bottles Set ,Oil Cruets Gift

The specs say that the package dimension is 7.8". Does anyone have the actual dimension of the dispenser?

I want to use this for homemade dressings with chopped garlic/herbs. Is the spout designed for that use, or should it be used for smooth liquids?

shouldn't oils be stored in dark-colored glass bottles so it they won't become rancid in the sunlight?

Will these leak if tipped over?