Does extra nat have any impact on speedfusion tunnel?

If running a speedfusion tunnel from a balance to a hub (where the hub has a public IP to enable the speedfusion tunnel to connect to a static IP), does it make any difference if WAN 2 is:
1.) transparent bridged to ISP assigned IP, or
2.) a connection from BR1 lan, so balance’s WAN IP is the private LAN IP assigned by BR1 nat?