Congratulations on your Stages.
I understand you also have the stands for the Stages.
My advise would be to use separate powered subwoofer (s).
This way you will have more freedom in placement/ integration. Also try and implement a high pass in your xover between stages and subs, something the mini grands never had. This will protect your bass ribbons from unecessarily high excursions. Keep in mind that if your bass ribbons fail or start the dreaded buzz, you will have two beautiful sculptures, but no more high end sound. APOGEE currently does not make bass ribbons for Stages.
Apogee Stages are great speakers, they just need to be treated with love & respect.