Hi,
I'm using Neat video since 2 years in AE, and I've just purchase it for Davinci Resolve.
In my color grading workflow I put it after a primary color correction(WB, contrast and saturation), before any qualification. It gives you a very pleasing and smooth color selection.
I normally try to denoise just on the chrominance channel, leaving luminance grain as it is. I'm now able to work in really hard condition at 1250 or 2000 ISO in ML RAW without worrying about video noise.
Neat video is a powerful denoiser, and if you want the best from it the only thing is to try by yourself, as always.