For this system you need 7.2 surround; nothing else will suffice! ;)
You may want to reconsider in-wall placement of speakers in the event that you will reconfigure the shop/work area. If you ever move things around within the space, you may want to change the location of the speakers.
Zd542 gives good idea on powered speakers. Another alternative is vintage gear. I have a lovely vintage Nikko stack with some monitors that resides on my oversized workbench.
You may want to reconsider in-wall placement of speakers in the event that you will reconfigure the shop/work area. If you ever move things around within the space, you may want to change the location of the speakers.
Zd542 gives good idea on powered speakers. Another alternative is vintage gear. I have a lovely vintage Nikko stack with some monitors that resides on my oversized workbench.