Depending on your plenum and intake runner lengths 8-12" may be sufficient to get a good uniform water injection/air charge mixture.
There are a few posts around about injecting before the turbo compressor/impeller. Historically it has not been good for the blades. Some think improved materials along with improved jet atomization may have negated some of the prior experience. I think in general though you will not find many people willing to risk injecting in front of their turbo.
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