I use a lot of craft store plants in my viv and haven't had any problems so far. Some things you'll want to watch out for are any exposed wire. Make sure the flowers won't come off and expose any pokey bits. Cut off any solid loops (some garlands have them to help with hanging). Also keep in mind the fabric floral is a little more time consuming to clean, but will also look really nice, so you'll just have to choose your battles. I have several fabric plants along with some plastic ones as well. Wash them well before putting them in the viv too, of course.
As for anchoring it in, I haven't done that yet (I'm lazy and just lay the plants on their sides, lol). I'd say though, if the plant is small enough (or your viv big enough), you could use a small pot filled with pebbles (real or glass) or maybe use hot glue or silicone to attach it to some decor (or just wedge it in someplace). I'd be weary of floral foam, the rough stuff tends to rub off into little dusty bits, and the other stuff turns brown after a while.
Hope that helps!
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