Two such systems have been found so far. Check the list of Earth-like worlds: from 2920 systems to date, 88 have two ELW-s, 6 have three and just the two have four. Those are BLU THUA JS-J D9-1 and SPEAMOEA WU-E D12-543. You can find other kinds of rarities in there too, although I'm not sure if there are any within planetary nebulae that have landable moon(s). I think that while rare, that might entirely be possible too.Actually, there is a system with 4 ELW's...
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There's also the one solitary brown dwarf that has an Earth-like world orbiting it.
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