Actually, you just make yourself confused to setting up the miner you just need is a worker name you can name them miner1(s9) and miner2(t17) and point them directly to the same pool. You can see your whole hashrate on the pool dashboard as a combined hashrate of these two miners.
If you are mining on solo mining with https://solo.ckpool.org/ you can just ignore the .RIG_ID and only put BTC address the RIG_ID
Sample setup for s9
URL: stratum+tcp://solo.ckpool.org:3333
Worker: 1PKN98VN2z5gwSGZvGKS2bj8aADZBkyhkZ
Pass: x
You can set up your both miner with the same pool config without adding something at the end of the BTC address.