how to differentiate same model phones in testSuiteCollection

I am trying to run a TestSuite collection of 2 Test Suites each containing a test case.
The 2 testSuites Automate 2 different APK files by itself. I tried to run this TestSuite Collection in parallel mode. i.e., ( 2 test cases executing 2 APKs parallel on 2 different Phones of same model type ( Motorola Moto E4 Phone) ) I see that both the TestSuites are executed on only 1 phone.

Can anyone help me in solving this issue.?