Hey thaaad, as a NS dad that wants my kids out on the trails with me I bought the Mac-ride about 4 years ago. I can't say enough good things about it. The quick and easy installation, the fact that it does not touch your frame. I started with it on a Spec. Enduro and had it on my Spec. Rockhopper and ended with it on My 2020 sight c2. All medium frames. I put but of my kids through it during this time and they loved riding with me.
The KRS is also a great product, other than it touches the frame and I would be hesitant to clamp it to a carbon frame.
Either or my recommendation is not to hesitate buy one as quick as you can and get the kids out on the trails with you!!! They will love it, you will love it.
Side note. I recently sold my Mac-Ride for $25 less than what I paid for it. After 4 years use it was still in mint condition.
Cheers, hope to see you out with your little ripper/s