These are almost 10 years old tablets, inexpensive to get (UK model, WiFi only). Installation works like a charm, using the Odin variant of the official instructions to install TWRP and then /e/. Things to remember: 1) device is already OEM unlocked by default, 2) to boot into download mode, Volume up and down is the other way round compared to a phone!
Performance is good, despite the age. Nice for sofa browsing, will also try video calls.
Edit: video calls using Conversations work, with a little bit of echo, but usable