But if you angled that heat plate it kinda works the same way....
Yes, I would say if you're using a heat plate it should be set at an angle so chicks can adjust how much heat they're getting, similar to how heating pads are usually set up.
I set up my heating pad a little differently, so the end result is "upside down," like so:


I don't have more than 3-4 chicks at a time, so this shape is fine for the number of chicks. When they're very young they'll stuff themselves all the way under the lowest point, so they get really toasty from the pad. As they get older and need less heat, they can climb into that open U portion in the center and sit with the heat source under them, so plenty of variance in warmer temperatures for them to choose from.