So sorry, just finding one mite means there are more, plus eggs. A tape test was only on a small part of the snake & they hide well on snakes too, under chin scales+.
Remove plastic plants & anything non-essential where they can hide or leave eggs. (hides & water bowl are essential, keep on white paper towels)
I'd have passed on Ivermectin shot too...far as I know, it's pretty harsh on their little bodies, for what is an external issue. Not saying you don't have to be careful
if using PAM or other stuff though... I've read posts about Frontline here- seems to be a fairly safe alternative, but never had to try it- OR PAM (Provent-A-Mite, NOT
the cooking spray!) but be careful to follow exact directions for whatever you use. Never tried Natural Chemistry either, btw. Happily it's been a few decades since I
dealt with mites, all I ever used was the "No Pest" strip (tiny piece & brief exposure) method, and a slightly soapy bath to drown all the mites I could.