The ground radials also clip onto the ground rod using alligator clips. I use two radials on the matching transformer and four at the terminator. The two on the matching transformer aren't really necessary. They do increase the received signal strength somewhat. The four radials at the terminator are absolutely necessary to get the ground impedance low enough to successfully terminate the Beverage.
More radials are better.
Arrange the radials symmetrically about the ground rod and antenna so that any signal pickup will cancel out. Those hardy souls who DXpedition from a tent or cabin using battery power needn't bother with coax feedlines. The intensity of the near-field diminishes with the third or fourth power of distance, so moving the antenna a little further away from local noise sources makes a tremendous difference in the received RFI noise level. In particular avoid Radio Shack RG-58 cable as it has poor shield coverage and consequently is quite leaky. I find it very helpful to use two grounds on the coax shield, one at the matching transformer and one near where the coax cable enters my shack or DXpedition cabin.