Happy Mothers day to all the mums for tomorrow.
Tile suppliers and interior concept designs will 99% of the time recommend non-slip matt tiles for all wet areas. Gloss will be far too slippery.
Not sure about your tiles and its surface, but applying sealant will make it worse. I had done it before, then spend 3 days scraping it off with thinner (felt like a drunk after few hours ). Sealant is mostly for outdoor use to make steps non-slippery.
My 2 cents.