L2TP server with two links

L2TP_TwoWan.png
Hi,
I have infrastructure like on picture without this red line. I have L2TP client and there are connected to public IP (11.11.11.11). Now on central location I have new link from another DSL provider (red line, 22.22.22.22) and I would like to use this link for failover. What would be best solution to accomplish this?
L2TP settings on client router:

/interface l2tp-client
add connect-to=11.11.11.11 disabled=no name=l2tp-out1 password=ExamplePass user=ExampleShop01

Because only client routers need to see central router (not client between themselves) I use static routing. This can be changed.

No one have idea?