On the other hand, it is not economical to acquire capacity totally unnecessary for a person's particular layout. If Dave wires up one R-S power supply to run 2 TIUs and has no problem, he has hit upon the most economical solution.
I note that you have been recommending the R-S power supply on the forum for many years, and I do not recall that, until recently, you have stated that it was not suitable for AIU-equipped TIUs.