Best connection would be via tape outs.
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Does the opinion change knowing that i have a RTR in place as well?Depends on the output impedance of the tape outs of the 912, which doesn't appear to be specified, and the input impedance of the particular RTR, and the input impedance of the Xciter, which is 100K.
Given the high input impedance of the Xciter, without knowing two of the three variables my guess is that you will have good results splitting the tape outs of the 912 and connecting them to both destinations. In saying that, I'm also assuming that the lengths of the interconnects to the RTR and the Xciter would not be particularly long (e.g., around six feet or less for each cable).