The extra distance between the amp and your other equipment might make a difference in the quality of the audio signal. If your gear is not particularly well shielded, then having the amp (with its large transformer) further away from your DAC and preamp might reduce any electro-magnetic interference, but if the shielding is good, then you will probably notice very little audible difference.
Ideally, you should also try to keep some distance between the DAC and the preamp, as some DAC units can produce RF interference that can affect the preamp.
Ideally, you should also try to keep some distance between the DAC and the preamp, as some DAC units can produce RF interference that can affect the preamp.