Keep it small. Roughly 30% of bees nest in twigs, reeds etc. The others mostly are ground nesters, and some are cavity nesters.
The biggest risk I've read about with the big "bee hotels" is parasites like mites. Larger is just more convenient. Smaller is less likely to have rampant disease or pests.
If you can, when you trim back stalks etc at the end of the season just leave a foot or so sticking out of the ground and the little twig nesters will find them. If you want to build a twig nester habitat, you can simply stick leftover stalks (from hyssop etc) in the ground or a pot in a protected area, and the bees will find them. Some wasps also use reeds etc. but they won't be the wasps you're worried about. You may not be able to tell they're not bees unless you look very closely.
The semi-social wasps like yellow jackets, mud daubers etc. will build their own nests wherever they can find a protected overhang, or under siding etc. they don't use the bee hotel setup usually. I have seen some build under an overhang in that kind of setup - under the roof peak.
Keep it small, you'll be OK. Once you start seeing the holes in cut stems you'll see the bee nests everywhere. Rose bushes, berries, shrubs...the little osmia, lasoglossum, etc. are very industrious.
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