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Thank you very much for your suggestion, Is it risky/spam if all  3 sites are hosted/registered on same hosting and by same person(same name and address), targeting same keywords but everything is unique as I mentioned above.

@thanks and agree with you... but I personally want to know - is it possible to target same keywords for 3 different websites, if each sites is not linking to each other, each have quality/informative content, unique design & different concept etc...

One of my client targeting same (5 Keywords) for 3 sites.

Domain &  Web Hosting is same for 3 sites.

Site A - 50.72.134.29
Site B - 50.72.140.227
Site C- 50.72.19.70

Some time ago, ranking dropped - but don't know if it is because on above things?

Is it OK? What is the best way to target same keywords for 3 different sites.