I have just put one into operation for testing. Initialise Eve via app, turn Danfoss RA to level 5, open quick release ring, pull off Danfoss. Three types of plastic adapters are supplied with Eve. Choke the RA adapter onto the valve until it "clicks" and then tighten the clamping jaws with the screw/nut provided. Now screw the Eve with its retaining ring onto the adapter and have it calibrated in the app. It will probably never be completely straight, but it works. Remember that all smart thermostats are electric. Two AA batteries are included. Let's see how long they last. I've already used rechargeable ones. I think they are ingenious with the Matter network and integration. Just needs Homepod MInis or Apple TVs, but the Apple aficionado already has that anyway ;)