Why do you feel that the Alto Utopias can't be around your kids? They weigh 167 lbs. each and would be very hard to tip. They are also tall enough that smaller kids wouldn't be able to reach the tweeters to poke dents in them (though that changes quickly enough).
Back when my first kid was born (1987) I bought a pair of speakers pretty well suited to toddlers and young kids: ADS L1090 columns. They were sealed enclosures, so there was no tempting port to stuff toys in, the midrange and tweeter were flexible domes, and the grills--difficult for little fingers to remove--were perforated metal, completely protecting the drivers behind. The columns had a narrow footprint, but I got the optional plinth bases to widen the stance, and these days you can get outriggers for nearly anything.
I'm not actually advocating for ADS speakers, though a pair of M12s or M15s might work for you. My point is that if you want speakers that are safe against little kids, they should be difficult to tip, not have ports visible and accessible, and the drivers need to be protected by something better than stretchy cloth.
Back when my first kid was born (1987) I bought a pair of speakers pretty well suited to toddlers and young kids: ADS L1090 columns. They were sealed enclosures, so there was no tempting port to stuff toys in, the midrange and tweeter were flexible domes, and the grills--difficult for little fingers to remove--were perforated metal, completely protecting the drivers behind. The columns had a narrow footprint, but I got the optional plinth bases to widen the stance, and these days you can get outriggers for nearly anything.
I'm not actually advocating for ADS speakers, though a pair of M12s or M15s might work for you. My point is that if you want speakers that are safe against little kids, they should be difficult to tip, not have ports visible and accessible, and the drivers need to be protected by something better than stretchy cloth.