It has been a while since I looked at this. I still use the LevelMate Pro which I find quite good. LevelMate has a new leveler out that fixes the few issues that remained with its earlier leveler (I believe they have contacts to connect to the trailer DC power, though I have not examined the new units to confirm).
The battery system powered by the button cells runs for a very long time. Keep an extra set though incase the batteries flake out.
The app for the Level Mate has gotten better. The downside is that it likes to "sniff" your phone. The simple way around that is to turn on airplane mode and click back on WiFi or bluetooth so that it will connect with the Level Mate.
On the cresent shaped leveling blocks, Beech Lane is still my favorite. One of the problems with these levelers are soft surfaces and sand. Normal and average surfaces it works great.