I tried using the HDR option in Lightroom - However I am unable to see the Merge HDR result.
Is there a method to set the HDR merge to be set to appear next to the original (tiff) photo in Lightroom Library.
There isn't really a trick to seeing the Merged HDR result. Once you create the image from the popup HDR window, it will be processed and show up in your library next to the original images. Here is an example, I selected 3 images and the second image was the new HDR image:
Keep in mind that the resulting HDR image has some unique attributes:
It is possible that your library is filtered to exclude one of the above attributes so I would clear out your filters.
Finally, as a user mentioned in the comments I would take a look at your sorting options. It is possible that your images are sorted in such a way that the new HDR result is not displayed near the other images. For example if the input images were created in 2014 and you created the HDR image in 2015 and were sorting by created date.
The HDR merged DNG out of ACR 9 is a 16 bit (floating point number) so it is not a 32 bit but has bigger value range than a 16 bit integer. I haven't done an experiment to see what the exposure range is between the two different methods. I know that the DNG one is -10 to +10 for exposure in the one I played with. I recommend you to use aurorahdr for such things good luck