After setting this up, and installed this router in the remote side, after several days of testing I notice that there was a 50% decrease on internet speed, so I had to route just the traffic for my primary side, and leaving the remote side with his own uplink for internet.
From primary side to secundary, there is a distance of 30kms, and both have uplinks of 100/100 Mbps.
Here is the issue described:
https://forum.netgate.com/topic/133011/solved-loss-of-internet-speed-while-on-vpn-from-site-to-site