The AM21 has a power pass through (another plug on the AM21 itself), that you can plug the HR21 into. So the pair, only needs one outlet in your UPS, Power Strip, or outlet
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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The AM21 has a power pass through (another plug on the AM21 itself), that you can plug the HR21 into. So the pair, only needs one outlet in your UPS, Power Strip, or outlet
HR21 has a power outlet as well, so either would work.
For me, I'll plug the HR21 into my conditioner and have the AM21 off the HR21