Question about Shelly Wall switch 2 - white

Unfortunately no, the Shelly Wall Switches do not fit into an EDIZIOdue frame.
The colour is also incorrect. Shelly is "glossy white", Feller is "matt white".
For the Shelly Wall Switches there are separate 1 and 2 frames available as separate products, i.e. you can replace the Feller frames.

Rather not, but the Shelly frame is more than recommendable

Unfortunately not. Different dimensions and mounting. But it is very high quality with the glass frame.