It’s not matter, and it’s not local to SmartThings, but this is one of my favorite power strips to use with SmartThings, and it makes a great proxy between SmartThings and HomeKit, since it works with both. Good safety certifications. As of this posting the price is down to $34 for the four outlet strip, but there’s a coupon for an extra two dollars off on the Amazon page. No custom code needed.
The UK has a six outlet model for £43 plus a £7 voucher on the page