I got a Redmi Note 7 today just so I could install UT on it. The experience wasn't so great, unfortunately. I'll report a few issues here, hopefully it might help someone.
The real nightmare was trying to unlock the device. Fortunately, on this one there is no 1 week waiting period, as there is on some other Xiaomi devices. But I ran into a problem where the device would disconnect on Fastboot when reading the "oem device-info". The same was happening when the unlocker tool was trying to read the info so it took a while to figure out which part was not working correctly.
Luckily, found a similar issue somewhere on Reddit, stating that it worked on an older PC. For me it did not work on one Windows laptop, the Java tool couldn't run on Linux, but fortunately it worked on a third machine.
After unlocking, the installer reported a wrong checksum for the downloaded vendor file, although the zip file has no errors.
Now, after the installation has completed, the phone is stuck on the boot logo and can't be turned off.