What you really need, of course, is a pair of N-Sats with dedicated wall brackets. These are particularly good for kids as the speakers won’t fall off unless you lift them vertically upwards for an inch or so. Not so easy to find these days.
K&M have so many brackets you really need to choose speakers first and then find one that suits your needs. They even have ones that work with speakers without mounting holes. Like shelves that gently clamp the botton 1cm front to back of a speaker and allow for some safe downward tilting.And just loads of back plates. So it’s really a matter of picking speakers and then doing homework.
But for sure, on-wall speakers would be preferred. Designed for that, they should perform better. ATC are great but for variety, PMC Wafer or Audiovector, or Dali all make really well regarded models.