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We have these too. I rate them and with a bit of faff you can get them flush against the wall (I have scribed around the faceplate on some uneven walls)
I fucking hate needing deeper back boxes though - our place had loads of surface mount sockets/switches and I have slowly replaced them but one led to me smashing through to the next room as my house is made from 200 year old cheese and hair apparently.
We have these for white screwless sockets: https://www.tlc-direct.co.uk/Main_Index/Wiring_Accessories_Menu_Index/A_White_All/SF_MW/index.html
They look nice but not particularly level, no.