wireguard remote peer and remote router questions

Hi. Running ROS 7.8 in my SoHo and i have wireguard setup between the router and my smartphone and laptop, by following the guide https://youtu.be/vn9ky7p5ESM, so far so good.
In a remote site i have another setup with mikrotik router. I would like to add this remote router to my wireguard vpn, but i am atuck on how to configure it.

https://help.mikrotik.com/docs/display/ROS/WireGuard#WireGuard-SitetoSiteWireGuardtunnel

https://forum.mikrotik.com/viewtopic.php?t=182340

Also I was having issues with a complex wg setup on vers 7.8.
I went to vers7.9rc2 (or rc3) and problem went away.

Also I provided a basic scenario to connect four mt routers to one main router here…
http://forum.mikrotik.com/t/what-type-of-vpn-should-i-use-to-connect-4-sites/166051/8

Which will make sense after reading the link above. Only config what you understand, copy and paste is a road to network unhapenis.