I've been running WT client and added a few watchtowers, but there is no activity (even though I know for a fact that at least one is functional), so my guess is that something is not right. I hope that the LND 0.16 update, which has quite a bit of watchtower updates fixes this.

I run Umbrel (the LND update did not make it there yet) and it will not let me delete any watchtowers I add (unless I go removing the .db file).