Another DirectAccess Server in same domain with different configuration

hi all,

I have DirectAccess Server working configured on edge with the self signed certificate. Now i want to implement other two direct access Server working as highly available using PKI on the same domain without deleting the current DAServer. After checking the Highly Available DirectAccess Server we will be removing the current direct Access Server and implement the HA DA. So what will be the solution and the steps to these scenarios.

Thanks,

Roshan