We actually plan to create different queues for different types of workloads, we are a bit seeing what the actual usage is to define what type of workloads make sense for us.

That sounds like a great path to take, it will make it very clear fro users on what they will be getting and why they should use specific queue.

As for the memory, yes the reasoning is clear, the main thing we'll have to see is hot define the limits, because we have nodes with quite different resources available, and this might get tricky, but I'll try and let's see what happens

Not sure if it helps, but I think this resource limitation (or book-keeping if you will) is one of the advanced feature of the enterprise version, But I would probably start with something simple just to get going before jumping to it.