Manual says Power supply voltage AC: 110 - 240 V which should cover US and EU standard voltages. The thread i sent you, they are using 110 VAC to power the device, but it’s your project.
Oh. I just saw you mentioned 24V AC… The Shelly devices are all for DC.
Are you sure you meant AC and not DC? I don’t know any 24V AC powered smart relays. The Shelly 1 (not PM or Pro) have a dry contact which can switch that, but cannot be powered by 24V AC and need a seperate power supply.