Is it possible to use the load balancing feature of the router for insuring a permanent internet connection, when one of the two used WANs is going offline? In detail: I have a location where we have

Hi, I have the following case: 3 different ISP's (NET, TIM and VIVO) I'd like to use those 3 ISP on the same appliance, but I need all of my computers connect to the internet using only 1 Public IP ev