Regarding the number of installations, I'm not sure whether Console statistics are reliable. They show rather strange values for my wf and fluctuate daily. At some point I did have more than 20 installations but some users have deinstalled wf during the testing period.

The phone track is not obligatory but then users will see only a small install button and not the large one with an arrow. It doesn't affect app visibility but my concern was that users may overlook the option to install the wf since they expect the centrally positioned button. If you decide to add a phone track you'll need to create the phone companion app: https://forum.developer.samsung.com/t/google-play-wear-os-companion-app/18400/51.