Ok, clear...
I was referring to the other issue with touch button not hawing memory in the sense that it would not remember it's state (ON/OFF). So if Shelly would cut off the turned on switch, then when Shelly would turn it back on , the switch would be turned off (as ON state would not be remembered by it).
But there should be no issues with this with the current wiring (in the above image).
I still don't understand what you've meant when saying :"Voltage of power supply should be higher than 24V DC. ".
I thought that exactly 24V DC should suffice as this is the common rated voltage also for led strips...