I used Flonase under my pods for quite a while last year. I asked multiple CDEs if there was a downside risk to my skin by spraying Flonase on it routinely (I thought I’d read about skin thinning or discoloration somewhere I never found again), and they said they were unaware of any issues.
I ended up wiping down the outside of a sandwich bag with an alcohol wipe to sanitize it, let it dry, spray a couple sprays of Flonase on the bag, and then wipe it generously on the area where I would put the pod. This gave me even distribution and full coverage which was hard to get when spraying directly from the Flonase, especially laterally, onto my skin.
I hope that helps…unless I misunderstood the question.