Well, I eventually got it installed, but then it got stuck during initial setup, but wasn't able to get through the initial setup.
When I booted up after installing both LineageOS and OpenGApps, I got the following
Getting your tablet ready...
Chose my network
Copy apps and data: Chose "Don't copy"
Just a sec...
Checking info...
Then I got a black screen.
After a while, I was able to get it back by pressing the power button, but then it just went back to "Checking Info", and then the black screen again.
Tried this with both "Stock" OpenGApps version and "Nano" version.
After struggling with this for a while, I gave up and re-installed the stock firmware (which was a bit of a challenge in itself).