putting more than one GFCI outlet on a single line is pointless, you can put one GFCI and several regular outlets on the same line the GFCI then protects all the outlets on that line, here is a dirct quote from the power company
To help reduce the likelihood of injury due to electrocutions inside and around the home, the ground fault circuit interrupter (GFCI) has been developed. The GFCI is designed to disconnect power much faster than a typical household circuit breaker or fuse. Most new homes are equipped with at least one ground fault circuit interrupter (GFCI). The most common GFCI is a special type of receptacle (outlet), usually located in the garage, kitchen or bathroom (usually where water is most likely to be present or where ground faults are most likely to occur). However, GFCI’s may also be part of a special circuit breaker or a portable device that can be installed on most standard outlets. Sometimes more than one outlet may be connected to the same GFCI. For example, your home may have a GFCI outlet located in the garage, but the outlets for the bathrooms, kitchen and outside may all be tied to that GFCI. If there is a problem at any of these outlets, the GFCI will disconnect power to all of them.
GFCI’s have a TEST and RESET button that should be used to test the GFCI each month. To test the GFCI, press the TEST button. Power should be disconnected at that location. Press the RESET button to restore power. If the TEST button does not cause the power to disconnect, call an electrician to check it out.
If your home does not have a GFCI, you may want to consider having one installed.
REMEMBER - a GFCI is not a substitute for good safety practices!