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It’s fine for multi-way switches, and probably even better than confounded switches, but as I mentioned they’re unnecessarily common which in this case means that they’re often used (at least in some settings in CH) for single-switch setups as well. For instance, my apartment had around 8-10 push switches of this type, with only 1 that was a three-way switch.

Maybe they should be installed sideways.

Here in USA, single-gang switches have "on" and "off" embossed on the switch, so the state is shown based on the position (oriented up is on). Multi-gang switches have no embossing.