dFine 2 will work stand alone but also works in the most popular editing software. As it is integrated into DxO's editor it will probably not be free anymore. dFine2 works well but if often overused due to pixel peeping, the bane of all photography. Do you really need noise reduction, if pixel peeping you would probably answer "yes" but if viewing images as intended b viewing distance and size, most of the time it is not worth the reduction in detail and edge contrast that NR introduces? Why are images too noisy? The most common cause is using auto exposure modes that do not know the speed of the object so assumes a higher shutter speed than really needed, which causes ISO to be elevated.
The question about the Adobe bundle can be answered only after knowing the number of images a week processed and what you are doing with them after processing. If you are doing a lot of images and they are being used for anything other than memory triggers, my suggestion is the PS/LR bundle is a great deal. The software is the most versatile and effective available but Photoshop is easy for basics but its real power takes a lot of study and practice. To be able to do a lot, might take a year of study and to be a master it might require a number of years to get the most out of it. But nothing else does what it can. Being the industry standard, there are hundreds of training video courses and thousands of tutorials on YouTube. Lightroom is a lot easier to master and can do what the majority seek to do with very little learning curve. For $9.99 a month any active photographer can justify it. Always having the latest version updated automatically has a lot of benefits so everyone is on the same page in version, support becomes easier. They provide a lot of incentive to keep up with the free upgrades by adding great features in almost every update.
Elements is good if you are not processing many images and are not interested in new features to learn but it is pretty limited.