We have multiple MPLS link configured on 1350 at HO and used Speed fusion for multiple spoke locations. Can we used multiple ILL link and aggregation on the same device and that would be further connected with Firewall for Internet access.
Yes ! You need to setup Portforwarding for Speedfusion on your links behind the firewall.
Lab example: SpeedFusion VPN Bonding over Public and Private WAN Links
Speedfusion behind Firewall: Configuring SpeedFusion behind a firewall