I've have put several prints from a Epson P600 on Canson Baryta Ph. into frames directly pressed against the glass for up to 6 months. All the prints were stored to dry for at least a couple of days, if not longer, before framing. I've seen no sign of any deleterious effects such as sticking to the glass, discolouration, distortion/rippling of the paper or fogging of the glass from outgassing. The photos get changed out a couple of times per year to liven up the space.
I realize that this is not best "archival" practise, but I'm not under the illusion that any of my photos are fine art, or worth more than the paper they're printed on. They're just short term decoration. If, I was selling stuff or when I'm trying to preserve more important memories I prefer to properly mount and mat photographs. chacun à son goût...
Mike