Stretch wrap the game (starboxes.com), cover it in blankets (harbor freight), protect the sides with cardboard (home depot), and for games with a folding backbox, pool noodles (dollar stores have them in the warmer months, so stock up) or pipe insulation (lowes in the winter months).

https://www.starboxes.com/stretch-wrap/blown-stretch-wrap/18-x-1500-x-80-4-rls-cs-hand-wrap-blown

https://www.harborfreight.com/72-inch-x-80-inch-movers-blanket-66537.html
https://www.harborfreight.com/40-inch-x-72-inch-movers-blanket-47262.html

Small boxes to protect the bottom of the game when standing up on end and to help it slide around easier:
https://www.homedepot.com/p/The-Home-Depot-16-in-L-x-12-in-W-x-12-in-D-Small-Box-1001004/202029361

Medium boxes laying flat to slide the game into the vehicle
https://www.homedepot.com/p/The-Home-Depot-18-in-L-x-18-in-W-x-16-in-D-Medium-Box-1001005/202029360

Large boxes folded to protect sides of the game:
https://www.homedepot.com/p/The-Home-Depot-18-in-L-x-18-in-W-x-24-in-D-Large-Box-1001006/202029359

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Yes, but make sure to put some padding between the backbox and the cabinet. A folded sheet of cardboard, pool noodle, or moving blanket would work.

I normally go around about 4 times with the stretch wrap to ensure that the backbox stays in place. A strap isn't necessary, and in fact would potentially cause some minor damage..

2 sheets (a flattened box) should be fine.

Like it's ready to move

Shrink wrap in 4 layers, protect the corners & edges with a couple layers of packing tape, protect all sides with cardboard, another couple layers of plastic to help hold the cardboard, and then wrap in a large blanket. I think that should be enough.