In 8.x-1.x it is only possible to have one rate widget per node (or entity).
This brings a lot of limitations when using the module and is also too far from the way the D7 version of Rate behaved.
In the D7 module the rate widgets were stored as configuration entities under admin/structure/rate.
You could easily define custom widgets, such as 10-star rating, emotions (angry, mad etc.), but also customize the appearance of the widget - label position, result function to be used etc. The options of each widget were also easily customizable (label, value to store etc.)