I'd always have it on matte after sticking a glossy print behind a glass frame. Can barely see a thing cause of all the glare.
Sorry to hijack but is there anything I can do? (I realise this could be the daftest question ever).
If you're getting a lot of reflection then arguably you're showing your work in the wrong place.![]()
Not really many options when you hanging them on the living room wall and not in the tate, which is why I always print matte!

Gloss is a definite "no no" for under glass,
I'm looking right now at 4 20x16 prints, behind glass, printed on gloss. They're just fine.
Like the guys say, it depends entirely on where they're hung. Cut your cloth accordingly. And never say 'never'.![]()