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XTR115: 3 XTR115 2 wire current loop transmitter on the same board

Part Number: XTR115
Other Parts Discussed in Thread: XTR111

Hello;

We're planning to use 3 different XTR115 in 2 wire configuration to have  current outputs for 3 different incoming PWM signals on the same board.

We've planned to use 3 different ground paths which is separated by the ferite beads for each XTR115's at Iret pins.They are connected to each other at common GND point. After, we read the post related with this situation that was shared here on forums before, we think that it will not work. 

Do they need to be isolated from each other by using different isolated regulator etc ?

Thanks in Advance