Any guarantees can be surpassed whenever 'excess' is available from other sites not using their capacity
The RN-SPN "internet speed" is physically much higher than the capacity you assign to the node, and will generally be able to surpass your allocation by 10% according to the documentation but in reality i've also seen higher results. I'd not 'trust' on the bonus to go unnoticed if you start bursting all the time, a sales person might come knocking to sell you more capacity 😉
QoS is applied on egress ('from' the RN), but you need to create a QoS profile to define classes and then define what those classes include via policy
https://docs.paloaltonetworks.com/prisma/prisma-access/prisma-access-panorama-admin/configure-quality-of-service-in-prisma-access/configure-quality-of-service-for-mobile-users-and-remote-networks#id3dbc4e78-ad07-4063-a552-09131e7d7b42
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