I might have gone a bit over the top on basing when they are in the open as they seem to be transporting their own shrubbery, but given they will normally be deployed in broken ground it'll probably work out OK.
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For Uwe, the groundwork is my basic mix of sand/crushed kitty-litter painted coffee and dry-brushed a pale yellow with a bit of autumn grass static grass for contrast. For these I added chopped up door mat for the long grass and broken cork for larger rocks.