XLR Splitter Impedance Matching - Worth It?

Hi all. I’m splitting 2 XLR line level audio signals into 3 channels each. I bought one nice device (used) online called the Whirlwind SPL1x3LL (line level). Unfortunately I can’t find another used one for a decent price. However there are plenty of mic impedance matched units, SPL1x3MIC which according to the manufacturer...