Garage gang boxes ground wires

[zapf]

I am running 12/2 along a wall in my garage and into 30 ci gang boxes that will be holding 2 20amp plugs. My question is do I have to connect all 5 grounds into one wire nut or is connecting the 2 wires from the plugins and a jumper to the other three wires so I end up with two wire nuts in the same box?

Thanks

[joed]

2 wire nuts is fine as long as all the grounds are connected together.