I'd just try it and see what gives the better result, having long wires between the receiver and ESC and placing the latter close to the motor or having long wires between the ESC and the motor and having the former close to the receiver.My guess would be that, while problematic, a long signal wire and 2 long constant voltage wires are still gonna be less of a problem than 3 long sync-critical wires. But if u wanted to get fancy u could probably even replace the normal "servo" cable with a double screened coaxial cable and have the signal on the center wire, GND on the inner screen and +5V on the outer screen. Maybe that would allow for longer connections without causing problems.
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