Moving te master might or might not improve thins.
It will not change te attenuation by anything significant - a few extra metres on 2000 or so is negligible.
However, if the internal wiring goes past your fridge freezer, hi-fi, TV, central heating pump, consumer unit, or runs close and in parallel with power cables then there is a good chance that your noise level in being pushed up by local noise. Taking the socket to the point of entry and having the modem there can help eliminate local noise.
M H C
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