This is a really short video previously posted on RDD Facebook page, showing my contraption for draining canned tomatoes for deep dish pizza.
Super high tech tomato draining apparatus:
pyrex measuring cup, strainer, spoon, gravity.
The spoon breaks the surface tension of the liquid in contact with the strainer to help it drain faster. At least that’s what I think the spoon is doing. 
Draining Your Tomatoes For Deep Dish Pizza Posted by Real Deep Dish – Chicago Style Pizza Done Right on Tuesday, March 31, 2020
If you’re wondering – NO, you don’t need to leave the can on top of the tomatoes while they drain.