Whatsminer m30s++ receptacle

Hello everyone i currently got ahold of some M30s++ and im wondering what the best way to connect them to power is. I have 220v trifasic panel, with 12 spaces. The miners came with nema 6-20p cables. I purchased nema 6-20 duplex receptacle. I would appreciate any input on how I can make better conections or improve the space on my panel to connect more miners.

P.S. Do you all know of a T type connector where i can plug in x2 10awg cable and x1 8awg or any way i can go about safely doing this?

In advance i would like to thank you for your time on reading my post and on any help or advice you might have for me.

P.S. #2 Hope everyone has happy holidays. And wishing everyone the best on this new year.