Multi WAN all in same Subnet

Hello all,

I've got an ISP who gives me 3 internet lines (3 separate modems) that are in bridge. Now do all the modem have an IP that is in the same subnet a /24. I can't put the modems in router modus that would be the smart thing to do.

So my example situation is:

Line 1: 10.0.0.2/24 -> 10.0.0.1

Line 2: 10.0.0.5/24 -> 10.0.0.1

Line 3: 10.0.0.10/24 -> 10.0.0.1

So the IP is in the same subnet and the gateway is te same.

Now i need to do a loadbalance on my FG 81E with 3 lines.

After searching the internet i found 1 option that might work.

CLI: config sys settings set allow-subnet-overlap enable end

Could anyone tell me if this  would work?