Once you are comfortable using all these 7th chord shapes, it is a good idea to memorize which forms can be found in the same area of the fretboard as chords I, IV and V in any particular key. For example, if chord I is a C form then chord IV can be found as an E form at the same fret and chord V can be found as a G form one fret down. A good way to learn these patterns is to visualize the forms superimposed on the fretboard. The following example demonstrates these forms in the key of G beginning with a C form of a G7 chord at the 8th fret.
Here is a summary of chords in positions which are close together on the fretboard. Memorize this summary and then experiment with the chords in all keys. This pattern applies regardless of whether the chord type is major, minor or dominant 7th.