Question about Weber Spirit II E-310 GBS

The 310 has three burners, the 210 only two.
If you have the space, be sure to buy a 3-burner model, which will give you good results when grilling indirectly.

I can only confirm: often meat that is either to be grilled "slowly" or simply kept a little warm can be treated very well by moving it to one side and igniting the opposite removed third of the gas.