I have a RF board 900 -2.5GHz with 4 channels that run through LNA, demuxer another amplifiers and then ADC.

On the current board each of these devices has their own dedicated low noise LDO regulator. this set of regulators are reproduces 4 times.

Is this the best practice in terms of noise separation or could you get by  with sharing a LDO across the 4 channels? and between devices?