If I understand what you want to do correctly, you want to advertise networks out of the main site and the DR site in BGP. If the main site goes down, you want all traffic to be redirected to the DR site. If that is the case, advertise the same networks out of both routers (ROUTER1 and ROUTER2) in BGP, but use a route-map to as-path prepend the DR site a couple of times so the preferred route is going out of the main store, when that connection goes down the routes will go across to the DR site.
ip access-list standard local-site-networks
permit 10.10.10.0 0.0.0.255
ip access-list standard remote-site-networks
permit 10.10.20.0 0.0.0.255
router bgp 64722 (change your AS number here, and in the route-map below)
neighbor 10.200.63.66 route-map BGP-to-ATT out
route-map BGP-to-ATT permit 10 match ip address local-site-networks route-map BGP-to-ATT permit 20 match ip address remote-site-networks set as-path prepend 64722 64722 64722 64722
If that's not what you want to do, you can also use IP SLAs to do tracked routes for the 10.15.1.0/24 network. If you run EIGRP between all of the remote stores and redistribute static into EIGRP, if the tracked route fails, the secondary route will install itself into the table and populate across EIGRP to all routers.
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