Load Balancing and Failover on RB2011UAS-2HnD-IN

Dear Seniors,

I am making a solution for my network. I have two internet connection. I have assign one router each for two connection to get a fixed IP.

ISP 1: 192.168.2.x
ISP 2: 192.168.3.x

The solution I want is

I want to combine these two connections to increase web browsing speed ( internet speed ). And if one of two connections fail, it will switch to working connection to stay connected to internet.

Regarding, RB2011UAS-2HnD-IN, I want the combine output on both Ethernet and WiFi simultaneously. So please help me how to do it by example. Thanks.