I would say that this would not work well if, say, of the three querents, 2 were relative strangers and one a close friend, biases of what the reader knows/does not know of the querent inevitably show through somewhat, even in the best of readers. I have never attempted a multi-person spread. If you want to try, perhaps try with 3 good friends and agree in advance that what you read may not be as accurate as an individual reading would be.
But, by all means try it out, perhaps it works well, and if so, i imagine many would be interested in your results.
M
MadMalik
@MadMalik