There's a bunch of methods. Some depend on the capsules your are using.
I have seen anything from really small, flesh tone headsets to the surgical tape you mention.
I have used them all too.
Headsets I don't like, they tend to move, get banged and if they're "home made" the capsule may end up pointing the wrong way.
Surgical tape as you mention works OK, but the actors seem to have a mole all the time, sweat is also a factor. I have also done this in the cheek instead of the temple, but the "mole issue" is even worse and the cable is hard to hide.
Best method I've seen and adopted after it, but requires good capsules and very carefull placement is right in the hair line (a big no-no with hats) and right above the ear. You can use hair clips as long as you take care not to cut into the wire.
I have no idea what a Hellerman tool is though
