I've seen a bit of chatter on here regarding Ups solutions, I've just spotted this on Ebay, being sold as a Hubitat ups.
Any battery pack that can power devices via USB will work. The device you listed just uses a barrel plug design with a USB adapter plug. That way it can claim it works for both Hubitat and SmartThings. This device will do fine powering just your hub but if you ever want to do more complex things such as powering a Ethernet switch, a router or cellular backup connections you will want more capacity with more options.