Hi,
the BPDU MAC address is that used by Cisco's
Per VLAN Spanning Tree. The name RSTP usually means the proprietary Rapid-PVST+ with Cisco. Depending on the port configuration Cisco will send different BPDUs, some to the standard BPDU destination MAC, some to the Cisco PVST+ MAC.
I cannot tell you the exact configuration you need for your network, because it depends on quite a few details.
I have tested Rapid-PVST+ compatibility between ExtremeXOS and Cisco IOS, and documented that at
https://www.unix-ag.uni-kl.de/~auerswal/exos-cisco-rapid-pvstp/. That might help you understand what you need in your network.
Thanks,
Erik