Thanks @Bruce .About "The alternative would be to turn this into a SD-WAN solution, but in that scenario you'd either need internet access from your MPLS cloud, or to configure one end as a VPN concentrator - which means another firewall (potentially MX) required.", that is something we do pretty often and works. There is another reason (not part of this threat) why this option is the one we need. Any way, we finally made it work and it goes like this. For the redundant route, instead of selecting the option "While next hop respond to ping" you have to select "while host respond to ping". This host can be on the other side as long as the IP of the host (192.168.0.1) it is included in the subnet (192.168.0.0/24 )that you want to reach.
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