PCQ-Download best practice

Just a quick question.

I have traffic being tagged depending on source and have those sets of traffic getting prioritized and rate limited in a Queue Tree. I am using PCQ-Download queues to evenly distribute the bandwidth between hosts in each Child Queue. I have “limit at” and “max limit” set for each child queue, is it also necessary to create a different Queue type with a different “Rate” setting for each PCQ Queue or will it work fine to just rely on the “limit at” and “max limit” caps of the child queue?

Thank you very much!