I know, you don’t need reminding. 
Doing a lot of couch railroading this past Spring - that’s the step up from armchair railroading - helped sort out a common problem: how to get the structures level. My solution calls for cheap slate tiles, which are then cut to shape
I make the base large enough to also fit the figures that go with it on there.
Ground cover and figures are glued in place using Weldbond adhesive. And then it’s time to “plant”, depending on the location I use the three point method or the two line method. Rocks and flagstone remnants are very handy for this. BTW the guy with the rucksack is “Heinrich the Hiker” - definitely not a local since he missed the turnoff to the station. Now the question will be “Does the Goat Girl speak proper German or will she answer him in Swiss dialect.” 
Apart from getting things level, this will also be a handy format to store the structures during the winter.