Where do I install the whole house structured water device?

The general concept with installation is to put your structuring device as close to the point of you as possible. This usually means filters and any mineral treatments come first and the device last. However, if convenience or other reason dictate putting the structuring device first go ahead and do that as there is no hard science that proves the device needs to come last. The most important part is having structured water, not whether the device is one direction or another by a few feet.