To go back to your original question…
I’m assuming you don’t want one of the plug-in modules because the kids could just remove it and then plug the entertainment devices into the wall socket…
So the short answer is there isn’t anything that works easily with smartthings in the US at the present time that can control both receptacles in an in wall outlet.
There are some dual zwave micros, but they don’t meet US specs for an outlet as they typically only support up to 10 A and US code almost everywhere requires at least 15A for an outlet. So they can work well for a light switch, but not the in wall receptacle.
Zigbee in wall dual micro from smartenIT that I mentioned might work with SmartThings, as it did at one time, but there have been a lot of changes since then and I don’t know of anyone currently using it. It’s a bit risky as the platform itself is changing and I’m not sure if it will be supported in the future. So you could look at that one with its own hub. But that has a limited set of devices.
As far as other platforms, as mentioned above Insteon makes a model that would work, but that would require their hub.
There are several HomeKit models now available with the features you’re looking for. You don’t need a special hub for those, but you do need either one Apple TV or one iPad or one HomePod so you can set up the automations. If you already use Apple devices, this can be a good choice, but if you only have android phones and tablets then it’s probably not worth it.
There are some ewelink Wi-Fi outlets at Amazon that work with Alexa, so you should be able to find at least one. Many of those are Chinese and do not have US safety certifications, though, so I personally wouldn’t use them for in wall receptacles. But that’s obviously an individual choice.
Sorry not to be more help. Most people with a smartthings hub just use the plug-in modules, but I understand that doesn’t match your requirements.