Avoids things like touch screen inputs also being flipped.
Note that these adjustments can't be applied directly to the playfield
due to how playfields are used in various rulesets (basically relying on
the `PlayfieldAdjustContainer` to get things in the right place).
Closes#24000.
I also took the freedom to add type checking, as we can't limit the
usage of `Add()` since it's a Container. The exception thrown also
advises of using the suggested `AddTrigger()` instead.