RBSXTR&R11E-LTE and dual wan failover

Hi all!
RBSXTR&R11E-LTE has a two sim card slots
It’s possible to configure RBSXTR&R11E-LTE as a router with Active - Passive failover between two sim card’s? Maybe somebody have a example of working config for that task?
Thank you!

https://wiki.mikrotik.com/wiki/Dual_SIM_Application

This article is very interesting, but the main question is HOW can i make failover between two SIM if both of them have a dynamic IP’s.
I know that if i have a two ISP with static IP and known gateways it’s not a problem using standard scripts, but when i use a dynamic IP&GW addresses i can’t use a route rules for “ping base” failover.
The main question is, how can i detect for example that IP 8.8.8.8 is not accessible via sim slot down, and switch it to sim slot up?

The SXT LTE is directional, so other question will be is the towers of the 2 ISP’s in same location?

Yes, on one tower we have several wireless internet providers.