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Hi, I'm Mike G and I'll be glad to assist you. Cut your opening tight to one stud and float a short 2X4/on the other side to hold the enclosure in the wall on that side.
Verticly. A couple of drywall screws will keep in place.
No, cut it and slip it into the wall on the side without a stud. Put two screws into the face of the wall to hold it in place. Set the panel and screw it to the wall stud and the floating stud. It is only to hold the box in the wall.
It's done all the time. You're welcome.