Using an underlay patch with 3 plus

After no previous issues, I have been having issues with being allergic to the adhesive on the actual sensor (not the cover patches).I believe it's due to it being summer and being outside sweating,and I am also prone to eczema in general. I do all the proper skin prep, use skin tac, flonase, etc. So I've been looking into underpatches.

I tried using one the other day that said to apply the sensor right over it without cutting a hole for the needle, and the needle didn't punch through. Also, it seems like it'd be hard to aim the applicator on a patch applied to the skin that has a hole precut in it. Does anyone have any tips or advice?