Help mounting stars!

IMHO it would be determined by how the back is made. If solid you could used two sided tape.

I would weight it by filling the crevices in the two bottom points. You could do this by filling with cement, or taping small bags of sand into the crevices, anything that will weight it down. You could always hot glue the two bottom points unless you think it might ruin the finish on your house.

We have them all over The Lone Star State, Texas. Yes, if yours are being hung outside, you need to mount each on a piece of wood, then the wood to the building. If you have a nail gun that takes heavy nails, use that. Heavy U-tacks will work. If you use a hammer and nails, hit the nails in at an angle, and in opposite directions from other nails. You may need to nail all five points, plus the center, even if it flattens the star some. If you have one side of the house that does not get as much wind, you might consider using that side. And you certainly could hang your 3D stars inside the house or an enclosed porch, and use the flat stars outside of your house, mounted flat against the house. Best wishes 😇

I would drill a hole in the valley of the V's two on the top and at least one on the bottom... then attach the star to the house with galvanized screws and a small washer... the screws and washer could be painted to match the star before you put it up.

you could also use a spacer between the house and the star (bottle cap, piece of wood, washers, etc... this would allow water to run behind the star and off... it would create interesting shadows too.

I wrapped thin wire around the screw that I use to hang it with. Then I wrapped the other end of the wire through the hanging hole in the star. My star has hung outside in all kinds of weather and has yet to falll down.

If your home is wood, and/or can have anything hammered or screwed into it, use that method. And perhaps a stainless would be your best bet for longevity.

On the backside of the star, be sure whatever you hang it with is closed after you hang it. I know that sounds confusing but if you use any kind of a screw-in hook, be sure the hanger (loop) portion is clamped together as well as you can.

On the bottom of your star, and in an inconspicuous place, put something at the inner corner. All this is to keep a gust of wind from getting under the star and thereby raising it up. Wind will wreck havoc with whatever you attach unless you secure it top and bottom.

I had an blank exterior wall at my last house. I used 2 sets of shutters nailed flush together. It gave the impression that there were two windows there. Between them, I put a faux wrought iron decorative piece. My method above was my experience to secure the metal (faux wrought iron) from blustery winds.

I go with Fiddledd224 suggestion. No drilling, gluing, nailing. Use a nail or eye screw on the wall. String a wire through the eye and run it through the hanging bracket on the star. Tighten the wire with a few twists to pull the star against the wall. Feed the ends behind the star point. Hung my wreath that way and the wind doesn't even grab it. It's tight to the wall.