Concurrent renders

I read that I can have up to 8 or 2 concurrent renders, my question is this:

Will shotstack put my render jobs into a queue and render all submitted videos eventually or should I build the queue on my end to make sure jobs don’t fail at a time when all my concurrent renders are in use?

So do requests fail when all my concurrencies are being used or being placed in a queue by shotstack?

They’ll be added to a queue. We won’t fail any of your renders because your queue is full.

Good to know and makes things easier, thanks!